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Direct air capture

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solution for direct air capture marks a significant innovation. This technology, still under refinement, stands out for its minimal energy requirements and its novel chemical process that enables efficient CO2 capture and release. This method's potential for scalability and its environmental benefits
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rely on semi-permeable membranes. This method requires little water and has a smaller footprint. Typically polymeric membranes, either glassy or rubbery, are used for direct air capture. Glassy membranes typically exhibit high selectivity with respect to Carbon Dioxide; however, they also have low
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In contrast to carbon capture and storage (CCS) which captures emissions from a point source such as a factory, DAC reduces the carbon dioxide concentration in the atmosphere as a whole. Thus, DAC can be used to capture emissions that originated in non-stationary sources such as airplanes.
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On May 8, 2024, Climeworks activated the world's largest DAC planet named Mammoth in Iceland. It will be able to pull 36,000 tons of carbon from the atmosphere a year at full capacity, according to Climeworks, equivalent to taking around 7,800 gas-powered cars off the road for a year.
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DAC was suggested in 1999 and is still in development. Several commercial plants are planned or in operation in Europe and the US. Large-scale DAC deployment may be accelerated when connected with economical applications or policy incentives.
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when dry, and releases it when exposed to moisture. A large part of the energy for the process is supplied by the latent heat of phase change of water. The technology requires further research to determine its cost-effectiveness.
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from the CCS network, and leakage from geological formations. Because DAC can be deployed far from the source of pollution, synthetic fuel produced with this method can use already existing fuel transport infrastructure.
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Most commercial techniques require large fans to push ambient air through a filter. More recently, Ireland-based company Carbon Collect Limited has developed the MechanicalTree™ which simply stands in the wind to capture
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DAC is not an alternative to traditional, point-source carbon capture and storage (CCS), rather it is a complementary technology that could be utilized to manage carbon emissions from distributed sources,
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products (concentration > 99%), while other applications such as agriculture can function with more dilute products (~ 5%). Since the air that is processed through DAC originally contains 0.04% CO
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align it with ongoing efforts by other companies listed in this section, contributing to the global pursuit of effective and sustainable carbon capture solutions.
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Freitas RA Jr. Diamond Trees (Tropostats): A Molecular Manufacturing Based System for Compositional Atmospheric Homeostasis. IMM Report No. 43, 10 Feb 2010;
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permeabilities. Membrane capture of carbon dioxide is still in development and needs further research before it can be implemented on a larger scale.
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to the atmosphere than it would capture. Moreover, using DAC for enhanced oil recovery would cancel any supposed climate mitigation benefits.
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Castro-Muñoz, Roberto; Zamidi Ahmad, Mohd; Malankowska, Magdalena; Coronas, Joaquín (October 2022). "A new relevant membrane application: CO
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Among the specific chemical processes that are being explored, three stand out: causticization with alkali and alkali-earth hydroxides,
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European Commission. Directorate General for Research and Innovation; European Commission's Group of Chief Scientific Advisors (2018).
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a day. An economic study of its pilot plant conducted from 2015 to 2018 estimated the cost at $ 94–232 per tonne of atmospheric CO
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DAC relying on amine-based absorption demands significant water input. It was estimated, that to capture 3.3 gigatonnes of CO
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sources, since the process can be quite power intensive. Future innovations may reduce the energy intensity of this process.
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significantly reduces the energy cost of Direct Air Capture, and that its geometry lends itself to scaling for gigaton CO
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stream that can undergo dehydration and compression, while simultaneously regenerating the chemical media for reuse.
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Flow diagram of direct air capture process using sodium hydroxide as the absorbent and including solvent regeneration
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forming carbonate minerals. The DAC plant uses low-grade waste heat from the plant, effectively eliminating more CO
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annually, which is then mixed into concrete using technologies from CarbonCure. Heirloom also has a contract with
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from the air running through a building's existing ventilation units inside buildings for removing atmospheric CO
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Partnering with California energy company Greyrock, Carbon Engineering converts a portion of its concentrated CO
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product formed from the captured gas. Forms of carbon sequestration such as geological storage require pure CO
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Erans, María; Sanz-Pérez, Eloy S.; Hanak, Dawid P.; Clulow, Zeynep; Reiner, David M.; Mutch, Greg A. (2022).
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Sanz-Pérez, Eloy S.; Murdock, Christopher R.; Didas, Stephanie A.; Jones, Christopher W. (12 October 2016).
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on those markets. For the end-to-end process to remain net carbon negative, DAC machines must be powered by
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DAC also requires much greater energy input in comparison to traditional capture from point sources, like
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from the air and turn it into zero-net-carbon gasoline and jet fuel. The company uses a DAC technology,
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Lackner, Klaus S. (1 February 2013). "The thermodynamics of direct air capture of carbon dioxide".
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is mineralized to concrete, stored or utilized to create synthetic products like food, textile or
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which intends to start a DAC‑to‑fuel business using Global Thermostat's technology.
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Sanz-Pérez, Eloy S.; Murdock, Christopher R.; Didas, Stephanie A.; Jones, Christopher W. (2016).
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and air. As of 2023 it is estimated that the total system cost is over $ 1,000 per tonne of CO
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Carbon Engineering is a commercial DAC company founded in 2009 and backed, among others, by
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Service, Robert (7 June 2018). "Cost plunges for capturing carbon dioxide from the air".
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from the atmosphere. The company has projects ranging from 40 to 50,000 tonnes per year.
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from the air directly into process electrolytes, where it is converted into alcohols by
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Climeworks's first industrial-scale DAC plant, which started operation in May 2017 in
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Keith, David W.; Holmes, Geoffrey; St. Angelo, David; Heide, Kenton (7 June 2018).
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because, at over US$ 1000, the cost per tonne of carbon dioxide is many times the
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An example of what Direct Air Capture could look like and how the process works.
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stream. Sodium hydroxide can be recycled from sodium carbonate in a process of
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Smit, Berend; Reimer, Jeffrey A.; Oldenburg, Curtis M.; Bourg, Ian C (2014).
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per year. To lower its energy requirements, the plant uses heat from a local
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with Chemicals: A Technology Assessment for the APS Panel on Public Affairs"
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One of the largest hurdles to implementing DAC is the cost of separating CO
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Beuttler, Christoph; Charles, Louise; Wurzbacher, Jan (21 November 2019).
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system, it can produce a negative emissions plant, but it would require a
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The company stated that it costs around $ 600 to capture one tonne of CO
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a year would require 300 km of water, or 4% of the water used for
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Large-scale DAC deployment can be accelerated by policy incentives.
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Nikulshina, V.; Ayesa, N.; Gálvez, M.E.; Steinfeld, A. (July 2008).
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research program. The CarbFix2 pilot plant project runs alongside a
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plant. After the capture, DAC generates a concentrated stream of CO
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through the application of energy (namely heat), resulting in a CO
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Global Thermostat is private company founded in 2010, located in
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reported growth in direct air capture global operating capacity.
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Carbon dioxide scrubber § Metal-organic frameworks (MOFs)
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Cooperative Mechanisms under Article 6 of the Paris Agreement
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Fasihi, Mahdi; Efimova, Olga; Breyer, Christian (July 2019).
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is injected 700 meters under the ground and mineralizes into
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is used to increase vegetable yields in a nearby greenhouse.
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Proponents of DAC argue that it is an essential component of
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Quarton, Christopher J.; Samsatli, Sheila (1 January 2020).
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while reducing the building's net emissions. The captured CO
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in which the latter will purchase 315,000 metric tons of CO
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Sigurdardottir, Ragnhildur; Rathi, Akshat (6 March 2021).
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Negative Emissions Technologies and Reliable Sequestration
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Illustrative model of greenhouse effect on climate change
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These applications require different concentrations of CO
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Soletair Power is a startup founded in 2016, located in
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Heirloom's first direct air capture facility opened in
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from air—Thermodynamic and thermogravimetric analyses"
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from ambient air is about 250 kWh per tonne of CO
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United Nations Framework Convention on Climate Change
1826:'Air Capture' Could Be Key to Slowing Global Warming" 1325:"Direct Air Capture / A key technology for net zero" 321:
In a cyclical process designed in 2012 by professor
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Method of carbon capture from carbon dioxide in air
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The company claims this 'passive capture' of CO 66:and be a "negative emissions technology" (NET). 4231: 4131:Intergovernmental Panel on Climate Change (IPCC) 1388:Introduction to carbon capture and sequestration 1192:"Carbon-dioxide-removal options are multiplying" 1225: 1223: 1137: 845: 1712: 1710: 2866:History of climate change policy and politics 2661: 489:creating carbon-neutral concrete alternative, 1998:"How Bill Gates aims to clean up the planet" 1943: 1220: 585:, including gasoline, diesel, and jet fuel. 274:levels, has earned the technology a name of 2983:Atlantic meridional overturning circulation 1784:"400 PPM: Can Artificial Trees Help Pull CO 1707: 1637:"400 PPM: Can Artificial Trees Help Pull CO 1289:"Direct Air Capture (Technology Factsheet)" 345: 266:The idea of using many small dispersed DAC 56:direct air carbon capture and sequestration 4212: 4200: 3657: 2668: 2654: 1317: 911: 445:electricity would end up releasing more CO 127:When combined with long-term storage of CO 3952: 3758:Adaptation strategies on the German coast 2891:United Nations Climate Change conferences 2560: 2241: 2215: 2135: 2031: 1969: 1944:Ranjan, Manya; Herzog, Howard J. (2011). 1915: 1819: 1526: 1247: 1122: 1089: 1041: 1031: 337:called Marathon MSA, which absorbs air CO 316: 261: 239:binds to solid sorbent in the process of 3462:Co-benefits of climate change mitigation 2502: 2452: 724:Global Thermostat has closed deals with 195:Most commercial techniques use a liquid 166: 26: 18: 3818:National Adaptation Programme of Action 3607:Land use, land-use change, and forestry 2503:Clifford, Catherine (1 February 2021). 2421: 2333: 2302: 1716: 1568: 1473: 457:Practical applications of DAC include: 379: 356:Other substances which can be used are 4232: 3467:Economics of climate change mitigation 3430:Gold Standard (carbon offset standard) 2943: 2771:Scientific consensus on climate change 2622: 2483: 2032:Diamandis, Peter H. (23 August 2019). 2027: 2025: 2023: 2021: 2019: 2017: 2015: 2013: 2011: 1854: 1781: 1634: 1424: 1422: 1420: 1418: 1416: 1380: 1378: 1376: 1374: 600:, which removes a certain amount of CO 492:enhancing productivity of algae farms, 333:can be efficiently separated using an 4126:Coupled Model Intercomparison Project 3951: 3656: 3392: 2942: 2854: 2735: 2687: 2649: 2591: 2542:from the original on 21 November 2021 2511:from the original on 21 November 2021 2197:from the original on 1 September 2019 2184: 2158: 2065: 2063: 2061: 2059: 1995: 1991: 1989: 1987: 1985: 1983: 1981: 1939: 1937: 1935: 1871:from the original on 25 December 2017 1836:from the original on 3 September 2019 1815: 1813: 1798:from the original on 4 September 2019 1757:Lenfest Center for Sustainable Energy 1702:http://www.imm.org/Reports/rep043.pdf 1669: 1651:from the original on 4 September 2019 1564: 1562: 1560: 1558: 1556: 1554: 1469: 1467: 1465: 1450:from the original on 3 September 2019 1283: 1281: 1279: 1277: 1275: 1273: 1271: 1269: 1267: 1063: 1061: 547: 162: 62:)), the overall process will achieve 4148:Representative Concentration Pathway 3089:Tipping points in the climate system 2765:Carbon dioxide in Earth's atmosphere 2573:from the original on 12 January 2021 2561:Takahashi, Dean (25 February 2020). 2465:from the original on 29 January 2020 2373:from the original on 9 November 2018 2303:Proctor, Darrell (1 December 2017). 2159:Simon, Frédéric (23 November 2021). 1676:BBC News | Science & Environment 1186: 1184: 973: 971: 969: 967: 965: 880:Center for Negative Carbon Emissions 697: 410:, due to the low concentration of CO 327:Center for Negative Carbon Emissions 280: 3919:Nationally determined contributions 3629:Individual action on climate change 2834:World energy supply and consumption 2434:from the original on 6 October 2019 2355: 2327: 2315:from the original on 26 August 2019 2284:from the original on 26 August 2019 2044:from the original on 29 August 2019 2008: 1682:from the original on 14 August 2017 1486:from the original on 26 August 2019 1413: 1371: 1341:from the original on 10 April 2022. 1305:from the original on 26 August 2019 1210:"The many prices of carbon dioxide" 791: 728:(which aims to use DAC to source CO 13: 4058:Fixed anvil temperature hypothesis 2675: 2453:Brustein, Joshua (30 April 2019). 2422:Service, Robert F. (3 July 2019). 2296: 2209: 2185:Doyle, Alister (11 October 2017). 2056: 1978: 1932: 1820:Schiffman, Richard (23 May 2016). 1810: 1672:"'Artificial trees' to cut carbon" 1551: 1462: 1391:. London: Imperial College Press. 1264: 1058: 1020:Energy & Environmental Science 873: 732:for its carbonated beverages) and 430:" connected to DAC installations. 54:in safe long-term storage (called 14: 4271: 3985:Satellite temperature measurement 3590:forestry for carbon sequestration 2871:History of climate change science 2403:from the original on 28 July 2021 1332:International Energy Agency (IEA) 1181: 962: 739: 247:is then desorbed from the solid. 243:. Through heat and vacuum, the CO 4211: 4199: 4188: 4187: 4175: 3836:Climate Change Performance Index 3215:Destruction of cultural heritage 2604:from the original on 28 May 2022 2484:Plumer, Brad (9 November 2023). 1670:Burns, Judith (27 August 2009). 916:Within the research domain, the 435:carbon capture and storage (CCS) 284: 75:carbon capture and storage (CCS) 3975:Instrumental temperature record 3926:Sustainable Development Goal 13 2616: 2585: 2554: 2523: 2496: 2477: 2446: 2415: 2385: 2334:Proctor, Darrell (8 May 2024). 2266: 2216:Tollefson, Jeff (7 June 2018). 2178: 2152: 2111: 1996:Vidal, John (4 February 2018). 1883: 1848: 1775: 1745: 1694: 1663: 1628: 1593: 1498: 1345: 802:Is a start-up company based in 717:The company claims to remove CO 452: 4043:Climate variability and change 3393: 3074:Retreat of glaciers since 1850 2623:Kazmer, Rick (10 April 2024). 1855:Yarris, Lynn (17 March 2015). 1474:Chalmin, Anja (16 July 2019). 1202: 1167:10.1016/j.apenergy.2019.113936 1131: 1098: 542: 439:carbon-free electricity source 335:anionic exchange polymer resin 1: 4153:Shared Socioeconomic Pathways 3688:Climate emergency declaration 2592:Patel, Prachi (28 May 2022). 2137:10.1016/j.jclepro.2019.03.086 2124:Journal of Cleaner Production 1857:"A Better Way of Scrubbing CO 1782:Biello, David (16 May 2013). 1635:Biello, David (16 May 2013). 955: 838:when used, emitting no net CO 780:, that can produce synthetic 607: 469:carbon-neutral synthetic fuel 4136:IPCC Sixth Assessment Report 3362:Middle East and North Africa 2688: 1971:10.1016/j.egypro.2011.02.193 1946:"Feasibility of air capture" 1896:Chemical Engineering Journal 1739:10.1016/j.energy.2012.09.012 1610:Chemical Engineering Journal 846:Heirloom Carbon Technologies 706:, New York, with a plant in 486:improving concrete strength, 433:When DAC is combined with a 363: 7: 3210:Depopulation of settlements 2855: 1894:direct air capture (DAC)". 1528:10.1021/acs.chemrev.6b00173 1249:10.1021/acs.chemrev.6b00173 1091:10.1016/j.joule.2018.05.006 1070:"A Process for Capturing CO 928: 592:solution. It reacts with CO 173:International Energy Agency 10: 4276: 3970:Global surface temperature 3861:Popular culture depictions 3773:Ecosystem-based adaptation 3503:Carbon capture and storage 3425:Carbon offsets and credits 2736: 2274:"Public Update on CarbFix" 2243:10.1038/d41586-018-05357-w 1334:. April 2022. p. 18. 795: 611: 551: 428:small nuclear power plants 349: 223:and precipitates a stable 4182:Climate change portal 4169: 4108: 4075:Extreme event attribution 3993: 3962: 3958: 3947: 3891: 3826: 3748: 3698:School Strike for Climate 3670: 3666: 3652: 3621: 3577:Climate-smart agriculture 3538: 3495: 3405: 3401: 3388: 3312: 3165: 3112: 2955: 2951: 2938: 2861: 2850: 2779: 2748: 2744: 2731: 2714:Climate change adaptation 2709:Climate change mitigation 2704:Effects of climate change 2694: 2683: 1908:10.1016/j.cej.2022.137047 1622:10.1016/j.cej.2007.09.007 1430:"Direct Air Capture of CO 935:Artificial photosynthesis 907:— a startup in London, UK 905:Mission Zero Technologies 828:carbon nanotube membranes 386:climate change mitigation 4085:Global warming potential 3892:International agreements 3539:Preserving and enhancing 2973:Arctic methane emissions 2895:Years in climate change 2802:Greenhouse gas emissions 2699:Causes of climate change 1124:10.3389/fclim.2019.00010 920:team's development of a 884:Arizona State University 690:than they both produce. 628:waste incineration plant 358:metal–organic frameworks 346:Metal-organic frameworks 4116:Climate change scenario 3768:Disaster risk reduction 3420:Carbon emission trading 3230:U.S. insurance industry 3200:Civilizational collapse 3047:sea surface temperature 1579:10.1126/science.aau4107 982:. Publications Office. 912:Innovations in Research 834:sources, the fuels are 526: 235:. Alternatively, the CO 4240:Carbon dioxide removal 4109:Research and modelling 3793:Nature-based solutions 3613:Nature-based solutions 3555:Carbon dioxide removal 3472:Fossil fuel divestment 3457:Climate risk insurance 3367:Small island countries 2978:Arctic sea ice decline 1480:Geoengineering Monitor 1296:Geoengineering Monitor 940:Carbon dioxide removal 806:which launched out of 675:. In this approach, CO 669:geothermal power plant 325:, the director of the 317:Moisture swing sorbent 262:Other explored methods 176: 69:The carbon dioxide (CO 64:carbon dioxide removal 32: 24: 4070:Earth's energy budget 3953:Background and theory 3841:Climate crisis (term) 3513:Fossil fuel phase-out 3407:Economics and finance 3372:by individual country 3314:By country and region 3289:Security and conflict 3284:Psychological impacts 2963:Abrupt climate change 2886:Charles David Keeling 2719:By country and region 1507:"Direct Capture of CO 495:enrichment of air in 462:enhanced oil recovery 443:fossil-fuel-generated 170: 30: 22: 3899:Glasgow Climate Pact 3560:Carbon sequestration 3125:Mass mortality event 1111:Frontiers in Climate 1074:from the Atmosphere" 899:Energy Impact Center 810:in 2019 to remove CO 673:Hellisheidi, Iceland 481:carbon sequestration 475:beverage carbonation 380:Environmental impact 4250:Climate engineering 4038:Climate sensitivity 3813:The Adaptation Fund 3269:Infectious diseases 3166:Social and economic 2363:"Global Thermostat" 2280:. 3 November 2017. 2234:2018Natur.558..173T 1962:2011EnPro...4.2869R 1792:Scientific American 1763:on 20 December 2012 1731:2013Ene....50...38L 1645:Scientific American 1521:(19): 11840–11876. 1242:(19): 11840–11876. 1216:. 20 November 2023. 1198:. 20 November 2023. 1159:2020ApEn..25713936Q 842:to the atmosphere. 708:Huntsville, Alabama 598:potassium carbonate 590:potassium hydroxide 588:The company uses a 4260:Direct air capture 3609:(LULUCF and AFOLU) 3581:Forest management 3565:Direct air capture 3530:Sustainable energy 3487:Net zero emissions 3482:Low-carbon economy 3477:Green Climate Fund 3264:Indigenous peoples 3157:Plant biodiversity 2945:Effects and issues 2490:The New York Times 1033:10.1039/D1EE03523A 891:– a subsidiary of 554:Carbon Engineering 548:Carbon Engineering 520:fugitive emissions 296:. You can help by 177: 163:Methods of capture 36:Direct air capture 33: 25: 4227: 4226: 4165: 4164: 4161: 4160: 4100:Radiative forcing 3943: 3942: 3939: 3938: 3763:Adaptive capacity 3648: 3647: 3644: 3643: 3508:Energy transition 3384: 3383: 3380: 3379: 3094:Tropical cyclones 3020:Urban heat island 2934: 2933: 2846: 2845: 2842: 2841: 2807:Carbon accounting 2761:Greenhouse effect 2727: 2726: 2367:Global Thermostat 2088:978-0-309-48452-7 1511:from Ambient Air" 997:978-92-79-82006-9 698:Global Thermostat 441:. The use of any 329:(CNCE), dilute CO 314: 313: 278:in popular media. 141:emissions trading 77:which captures CO 4267: 4215: 4214: 4203: 4202: 4191: 4190: 4180: 4179: 4178: 4143:Paleoclimatology 3960: 3959: 3949: 3948: 3710:Ecological grief 3693:Climate movement 3668: 3667: 3654: 3653: 3634:Plant-based diet 3525:Renewable energy 3403: 3402: 3390: 3389: 3225:Economic impacts 3147:Invasive species 3003:Coastal flooding 2953: 2952: 2940: 2939: 2876:Svante Arrhenius 2852: 2851: 2822:from agriculture 2812:Carbon footprint 2797:Greenhouse gases 2746: 2745: 2733: 2732: 2685: 2684: 2670: 2663: 2656: 2647: 2646: 2640: 2639: 2637: 2635: 2620: 2614: 2613: 2611: 2609: 2589: 2583: 2582: 2580: 2578: 2558: 2552: 2551: 2549: 2547: 2527: 2521: 2520: 2518: 2516: 2500: 2494: 2493: 2481: 2475: 2474: 2472: 2470: 2450: 2444: 2443: 2441: 2439: 2419: 2413: 2412: 2410: 2408: 2399:. 28 June 2021. 2389: 2383: 2382: 2380: 2378: 2359: 2353: 2352: 2350: 2348: 2331: 2325: 2324: 2322: 2320: 2300: 2294: 2293: 2291: 2289: 2270: 2264: 2263: 2245: 2213: 2207: 2206: 2204: 2202: 2182: 2176: 2175: 2173: 2171: 2165:www.euractiv.com 2156: 2150: 2149: 2139: 2115: 2109: 2108: 2067: 2054: 2053: 2051: 2049: 2029: 2006: 2005: 1993: 1976: 1975: 1973: 1941: 1930: 1929: 1919: 1887: 1881: 1880: 1878: 1876: 1852: 1846: 1845: 1843: 1841: 1817: 1808: 1807: 1805: 1803: 1779: 1773: 1772: 1770: 1768: 1759:. Archived from 1753:"Carbon Capture" 1749: 1743: 1742: 1714: 1705: 1698: 1692: 1691: 1689: 1687: 1667: 1661: 1660: 1658: 1656: 1632: 1626: 1625: 1597: 1591: 1590: 1566: 1549: 1548: 1530: 1515:Chemical Reviews 1502: 1496: 1495: 1493: 1491: 1471: 1460: 1459: 1457: 1455: 1449: 1438: 1426: 1411: 1410: 1382: 1369: 1368: 1366: 1364: 1349: 1343: 1342: 1340: 1329: 1321: 1315: 1314: 1312: 1310: 1304: 1293: 1285: 1262: 1261: 1251: 1236:Chemical Reviews 1227: 1218: 1217: 1206: 1200: 1199: 1188: 1179: 1178: 1144: 1135: 1129: 1128: 1126: 1102: 1096: 1095: 1093: 1084:(8): 1573–1594. 1065: 1056: 1055: 1045: 1035: 1026:(4): 1360–1405. 1011: 1002: 1001: 975: 893:Reykjavik Energy 824:electrocatalysis 798:Prometheus Fuels 792:Prometheus Fuels 788:from buildings. 784:from captured CO 664: 660: 649:Reykjavik Energy 371:separation of CO 309: 306: 288: 281: 276:artificial trees 225:sodium carbonate 217:sodium hydroxide 149:renewable energy 4275: 4274: 4270: 4269: 4268: 4266: 4265: 4264: 4230: 4229: 4228: 4223: 4176: 4174: 4157: 4104: 4095:Orbital forcing 3989: 3954: 3935: 3909:Paris Agreement 3887: 3883:Warming stripes 3822: 3788:Managed retreat 3783:Loss and damage 3744: 3678:Business action 3662: 3640: 3617: 3540: 3534: 3491: 3452:Climate finance 3397: 3376: 3308: 3161: 3137:Extinction risk 3113:Flora and fauna 3108: 3069:Permafrost thaw 3064:Ozone depletion 2993:Extreme weather 2947: 2930: 2857: 2838: 2775: 2740: 2723: 2690: 2679: 2674: 2644: 2643: 2633: 2631: 2621: 2617: 2607: 2605: 2590: 2586: 2576: 2574: 2559: 2555: 2545: 2543: 2528: 2524: 2514: 2512: 2501: 2497: 2482: 2478: 2468: 2466: 2451: 2447: 2437: 2435: 2420: 2416: 2406: 2404: 2391: 2390: 2386: 2376: 2374: 2361: 2360: 2356: 2346: 2344: 2332: 2328: 2318: 2316: 2301: 2297: 2287: 2285: 2272: 2271: 2267: 2214: 2210: 2200: 2198: 2183: 2179: 2169: 2167: 2157: 2153: 2116: 2112: 2089: 2069: 2068: 2057: 2047: 2045: 2038:Singularity Hub 2030: 2009: 1994: 1979: 1950:Energy Procedia 1942: 1933: 1893: 1888: 1884: 1874: 1872: 1860: 1853: 1849: 1839: 1837: 1825: 1818: 1811: 1801: 1799: 1787: 1780: 1776: 1766: 1764: 1751: 1750: 1746: 1715: 1708: 1699: 1695: 1685: 1683: 1668: 1664: 1654: 1652: 1640: 1633: 1629: 1605: 1598: 1594: 1567: 1552: 1510: 1503: 1499: 1489: 1487: 1472: 1463: 1453: 1451: 1447: 1443:. 1 June 2011. 1436: 1433: 1428: 1427: 1414: 1399: 1383: 1372: 1362: 1360: 1351: 1350: 1346: 1338: 1327: 1323: 1322: 1318: 1308: 1306: 1302: 1298:. 24 May 2018. 1291: 1287: 1286: 1265: 1228: 1221: 1208: 1207: 1203: 1190: 1189: 1182: 1142: 1136: 1132: 1103: 1099: 1073: 1066: 1059: 1012: 1005: 998: 976: 963: 958: 931: 914: 876: 874:Other companies 869: 861: 848: 841: 821: 813: 800: 794: 787: 767: 763: 759: 742: 731: 720: 713: 700: 689: 678: 662: 661:Union's Horizon 658: 647:partnered with 640: 633: 625: 616: 610: 603: 595: 580: 573: 569: 556: 550: 545: 538: 534: 529: 513: 509: 505: 455: 448: 425: 421: 417: 413: 398: 390:Paris Agreement 382: 374: 366: 354: 348: 340: 332: 319: 310: 304: 301: 294:needs expansion 273: 264: 246: 238: 230: 222: 214: 191: 187: 183: 165: 130: 123: 119: 96: 80: 72: 49: 17: 12: 11: 5: 4273: 4263: 4262: 4257: 4255:Sustainability 4252: 4247: 4245:Carbon dioxide 4242: 4225: 4224: 4222: 4221: 4209: 4197: 4185: 4170: 4167: 4166: 4163: 4162: 4159: 4158: 4156: 4155: 4150: 4145: 4140: 4139: 4138: 4128: 4123: 4118: 4112: 4110: 4106: 4105: 4103: 4102: 4097: 4092: 4087: 4082: 4077: 4072: 4067: 4062: 4061: 4060: 4050: 4048:Cloud feedback 4045: 4040: 4035: 4030: 4029: 4028: 4023: 4018: 4013: 4003: 3997: 3995: 3991: 3990: 3988: 3987: 3982: 3977: 3972: 3966: 3964: 3956: 3955: 3945: 3944: 3941: 3940: 3937: 3936: 3934: 3933: 3928: 3923: 3922: 3921: 3916: 3906: 3904:Kyoto Protocol 3901: 3895: 3893: 3889: 3888: 3886: 3885: 3880: 3879: 3878: 3873: 3868: 3858: 3856:Media coverage 3853: 3848: 3846:Climate spiral 3843: 3838: 3832: 3830: 3824: 3823: 3821: 3820: 3815: 3810: 3805: 3800: 3795: 3790: 3785: 3780: 3775: 3770: 3765: 3760: 3754: 3752: 3746: 3745: 3743: 3742: 3737: 3735:Public opinion 3732: 3727: 3722: 3717: 3712: 3707: 3702: 3701: 3700: 3690: 3685: 3683:Climate action 3680: 3674: 3672: 3664: 3663: 3650: 3649: 3646: 3645: 3642: 3641: 3639: 3638: 3637: 3636: 3625: 3623: 3619: 3618: 3616: 3615: 3610: 3604: 3603: 3602: 3597: 3595:REDD and REDD+ 3592: 3587: 3579: 3574: 3572:Carbon farming 3569: 3568: 3567: 3562: 3552: 3546: 3544: 3536: 3535: 3533: 3532: 3527: 3522: 3517: 3516: 3515: 3505: 3499: 3497: 3493: 3492: 3490: 3489: 3484: 3479: 3474: 3469: 3464: 3459: 3454: 3449: 3444: 3439: 3434: 3433: 3432: 3422: 3417: 3411: 3409: 3399: 3398: 3386: 3385: 3382: 3381: 3378: 3377: 3375: 3374: 3369: 3364: 3359: 3354: 3349: 3344: 3339: 3334: 3329: 3324: 3318: 3316: 3310: 3309: 3307: 3306: 3304:Water security 3301: 3299:Water scarcity 3296: 3294:Urban flooding 3291: 3286: 3281: 3276: 3271: 3266: 3261: 3256: 3255: 3254: 3244: 3239: 3234: 3233: 3232: 3222: 3217: 3212: 3207: 3202: 3197: 3192: 3187: 3186: 3185: 3180: 3169: 3167: 3163: 3162: 3160: 3159: 3154: 3149: 3144: 3142:Forest dieback 3139: 3134: 3129: 3128: 3127: 3116: 3114: 3110: 3109: 3107: 3106: 3101: 3096: 3091: 3086: 3081: 3079:Sea level rise 3076: 3071: 3066: 3061: 3060: 3059: 3054: 3052:stratification 3049: 3044: 3039: 3034: 3024: 3023: 3022: 3017: 3007: 3006: 3005: 2995: 2990: 2985: 2980: 2975: 2970: 2965: 2959: 2957: 2949: 2948: 2936: 2935: 2932: 2931: 2929: 2928: 2927: 2926: 2921: 2916: 2911: 2906: 2901: 2893: 2888: 2883: 2878: 2873: 2868: 2862: 2859: 2858: 2848: 2847: 2844: 2843: 2840: 2839: 2837: 2836: 2831: 2830: 2829: 2824: 2819: 2817:Carbon leakage 2814: 2809: 2799: 2794: 2789: 2783: 2781: 2777: 2776: 2774: 2773: 2768: 2758: 2756:Climate system 2752: 2750: 2742: 2741: 2729: 2728: 2725: 2724: 2722: 2721: 2716: 2711: 2706: 2701: 2695: 2692: 2691: 2681: 2680: 2677:Climate change 2673: 2672: 2665: 2658: 2650: 2642: 2641: 2615: 2584: 2553: 2522: 2495: 2476: 2445: 2428:Science | AAAS 2414: 2384: 2354: 2326: 2309:POWER Magazine 2295: 2265: 2208: 2177: 2151: 2110: 2087: 2079:10.17226/25259 2055: 2007: 1977: 1931: 1891: 1882: 1858: 1847: 1823: 1809: 1788:from the Air?" 1785: 1774: 1744: 1706: 1693: 1662: 1641:from the Air?" 1638: 1627: 1616:(1–3): 62–70. 1603: 1592: 1550: 1508: 1497: 1461: 1431: 1412: 1397: 1370: 1344: 1316: 1263: 1219: 1201: 1180: 1147:Applied Energy 1130: 1097: 1071: 1057: 1003: 996: 960: 959: 957: 954: 953: 952: 947: 942: 937: 930: 927: 913: 910: 909: 908: 902: 896: 886: 875: 872: 867: 859: 847: 844: 839: 836:carbon neutral 819: 811: 796:Main article: 793: 790: 785: 770:renewable fuel 765: 761: 757: 741: 740:Soletair Power 738: 729: 718: 711: 699: 696: 687: 676: 641:from the air. 638: 631: 623: 612:Main article: 609: 606: 604:from the air. 601: 593: 583:synthetic fuel 578: 571: 567: 564:Murray Edwards 552:Main article: 549: 546: 544: 541: 536: 532: 528: 525: 511: 507: 503: 500: 499: 493: 490: 487: 484: 478: 472: 467:production of 465: 454: 451: 446: 423: 419: 415: 411: 396: 381: 378: 372: 365: 362: 350:Main article: 347: 344: 338: 330: 318: 315: 312: 311: 305:September 2019 291: 289: 271: 263: 260: 244: 236: 228: 220: 219:reacts with CO 212: 189: 185: 181: 164: 161: 128: 121: 117: 94: 78: 70: 47: 44:carbon dioxide 15: 9: 6: 4: 3: 2: 4272: 4261: 4258: 4256: 4253: 4251: 4248: 4246: 4243: 4241: 4238: 4237: 4235: 4220: 4219: 4210: 4208: 4207: 4198: 4196: 4195: 4186: 4184: 4183: 4172: 4171: 4168: 4154: 4151: 4149: 4146: 4144: 4141: 4137: 4134: 4133: 4132: 4129: 4127: 4124: 4122: 4121:Climate model 4119: 4117: 4114: 4113: 4111: 4107: 4101: 4098: 4096: 4093: 4091: 4088: 4086: 4083: 4081: 4078: 4076: 4073: 4071: 4068: 4066: 4063: 4059: 4056: 4055: 4054: 4053:Cloud forcing 4051: 4049: 4046: 4044: 4041: 4039: 4036: 4034: 4031: 4027: 4024: 4022: 4019: 4017: 4014: 4012: 4009: 4008: 4007: 4004: 4002: 3999: 3998: 3996: 3992: 3986: 3983: 3981: 3978: 3976: 3973: 3971: 3968: 3967: 3965: 3961: 3957: 3950: 3946: 3932: 3929: 3927: 3924: 3920: 3917: 3915: 3912: 3911: 3910: 3907: 3905: 3902: 3900: 3897: 3896: 3894: 3890: 3884: 3881: 3877: 3874: 3872: 3869: 3867: 3864: 3863: 3862: 3859: 3857: 3854: 3852: 3849: 3847: 3844: 3842: 3839: 3837: 3834: 3833: 3831: 3829: 3828:Communication 3825: 3819: 3816: 3814: 3811: 3809: 3808:Vulnerability 3806: 3804: 3801: 3799: 3796: 3794: 3791: 3789: 3786: 3784: 3781: 3779: 3778:Flood control 3776: 3774: 3771: 3769: 3766: 3764: 3761: 3759: 3756: 3755: 3753: 3751: 3747: 3741: 3738: 3736: 3733: 3731: 3728: 3726: 3723: 3721: 3718: 3716: 3713: 3711: 3708: 3706: 3703: 3699: 3696: 3695: 3694: 3691: 3689: 3686: 3684: 3681: 3679: 3676: 3675: 3673: 3669: 3665: 3661: 3655: 3651: 3635: 3632: 3631: 3630: 3627: 3626: 3624: 3620: 3614: 3611: 3608: 3605: 3601: 3600:reforestation 3598: 3596: 3593: 3591: 3588: 3586: 3585:afforestation 3583: 3582: 3580: 3578: 3575: 3573: 3570: 3566: 3563: 3561: 3558: 3557: 3556: 3553: 3551: 3548: 3547: 3545: 3543: 3537: 3531: 3528: 3526: 3523: 3521: 3520:Nuclear power 3518: 3514: 3511: 3510: 3509: 3506: 3504: 3501: 3500: 3498: 3494: 3488: 3485: 3483: 3480: 3478: 3475: 3473: 3470: 3468: 3465: 3463: 3460: 3458: 3455: 3453: 3450: 3448: 3445: 3443: 3440: 3438: 3435: 3431: 3428: 3427: 3426: 3423: 3421: 3418: 3416: 3415:Carbon budget 3413: 3412: 3410: 3408: 3404: 3400: 3396: 3391: 3387: 3373: 3370: 3368: 3365: 3363: 3360: 3358: 3355: 3353: 3350: 3348: 3345: 3343: 3340: 3338: 3335: 3333: 3330: 3328: 3325: 3323: 3320: 3319: 3317: 3315: 3311: 3305: 3302: 3300: 3297: 3295: 3292: 3290: 3287: 3285: 3282: 3280: 3277: 3275: 3272: 3270: 3267: 3265: 3262: 3260: 3257: 3253: 3252:Mental health 3250: 3249: 3248: 3245: 3243: 3240: 3238: 3235: 3231: 3228: 3227: 3226: 3223: 3221: 3218: 3216: 3213: 3211: 3208: 3206: 3203: 3201: 3198: 3196: 3193: 3191: 3188: 3184: 3183:United States 3181: 3179: 3176: 3175: 3174: 3171: 3170: 3168: 3164: 3158: 3155: 3153: 3150: 3148: 3145: 3143: 3140: 3138: 3135: 3133: 3130: 3126: 3123: 3122: 3121: 3118: 3117: 3115: 3111: 3105: 3102: 3100: 3097: 3095: 3092: 3090: 3087: 3085: 3082: 3080: 3077: 3075: 3072: 3070: 3067: 3065: 3062: 3058: 3055: 3053: 3050: 3048: 3045: 3043: 3040: 3038: 3037:deoxygenation 3035: 3033: 3032:acidification 3030: 3029: 3028: 3025: 3021: 3018: 3016: 3013: 3012: 3011: 3008: 3004: 3001: 3000: 2999: 2996: 2994: 2991: 2989: 2986: 2984: 2981: 2979: 2976: 2974: 2971: 2969: 2966: 2964: 2961: 2960: 2958: 2954: 2950: 2946: 2941: 2937: 2925: 2922: 2920: 2917: 2915: 2912: 2910: 2907: 2905: 2902: 2900: 2897: 2896: 2894: 2892: 2889: 2887: 2884: 2882: 2879: 2877: 2874: 2872: 2869: 2867: 2864: 2863: 2860: 2853: 2849: 2835: 2832: 2828: 2827:from wetlands 2825: 2823: 2820: 2818: 2815: 2813: 2810: 2808: 2805: 2804: 2803: 2800: 2798: 2795: 2793: 2790: 2788: 2787:Deforestation 2785: 2784: 2782: 2778: 2772: 2769: 2766: 2762: 2759: 2757: 2754: 2753: 2751: 2747: 2743: 2739: 2734: 2730: 2720: 2717: 2715: 2712: 2710: 2707: 2705: 2702: 2700: 2697: 2696: 2693: 2686: 2682: 2678: 2671: 2666: 2664: 2659: 2657: 2652: 2651: 2648: 2630: 2629:The Cool Down 2626: 2619: 2603: 2599: 2598:IEEE Spectrum 2595: 2588: 2572: 2568: 2564: 2557: 2541: 2537: 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Index

Flow diagram of direct air capture process using sodium hydroxide as the absorbent and including solvent regeneration.

carbon dioxide
sequestered
carbon dioxide removal
carbon capture and storage (CCS)
point sources
cement
bioenergy
sequestration
utilization
alkaline
solvent
sorbents
emissions trading
carbon price
renewable energy

International Energy Agency
solvent
amine
caustic
absorb
sodium hydroxide
sodium carbonate
causticizing
chemisorption
carbonation
adsorbents
scrubbers

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