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Direct Air Capture (DAC) Geoengineering Technology Briefing Jan 2021 Direct Air Capture (DAC) Description and purpose of the technology Direct Air Capture (DAC) is a proposed Greenhouse Gas Removal (GGR) technology that some theorize could remove CO2 (and potentially other greenhouse gases) from the earth’s atmosphere on a large scale. In these proposals, the carbon is stored either underground through Carbon Capture and Storage (CCS) or in products of varying durability Direct Air Capture’s high cost means close ties with the oil industry with through Carbon Capture, are its most likely path to adoption. Use and Storage (CCUS) techniques. Additional DAC approaches include CO2 capture with battery-type devices, electrochemical DAC approaches use chemical reactions to reduction of CO or sorbents with humidity- scrub CO from the atmosphere, using 2 2 based release processes. The designs of the substances able to act as a selective CO filter. 2 proposed DAC plants range from shipping The two most developed processes are liquid containers filled with CO collectors to artificial solvents and solid sorbents: CO dissolves in 2 2 trees.2 liquid solvent material, e.g. a strong hydroxide solution, or sticks to the surface of a solid All forms of DAC are extremely energy- and sorbent, such as a plastic resin. Several DAC cost-intensive. The entire capture process for concepts use large fans that move ambient air one tonne of CO2 requires between 5 to 10 GJ of through the filters to enhance the capture electrical and/or thermal energy.3 Cost process, because CO2 concentration in the estimates for DAC range from US$ ~100 to atmosphere is in the parts per US$ ~1,000 per tonne, but lower costs for DAC have only been million range. Point of proven theoretically.4 To have The CO filtering process, 2 Intervention: any significant effect on global however, is only the first step. CO concentrations, DAC would To allow their repetitive use, 2 need to be rolled out on a vast the filters must be able to scale, raising serious questions release the captured CO . This Reality Check: 2 about the large amount of regeneration process typically energy it requires, the levels of requires high temperature water usage for some (80°C to 800°C), which in turn technologies, land usage, and requires high energy inputs.1 the toxicity impacts from and the disposal of the chemical Its just Its being sorbents used. In addition, safe a theory implemented and long-term CO2 storage cannot be guaranteed. GEOENGINEERINGMONITOR.ORG Analysis and critical perspectives on climate engineering [email protected] If a CCS approach is used, the captured CO2 is To have any significant effect compressed into liquid form and transported to sites where it could be pumped into geological on global CO2 concentrations, formations – theoretically for long-term DAC would need to be rolled out storage, but that technology comes with a “on a vast scale, raising serious whole range of risks, among which leakage is an important one (see Technology Briefing on questions about the large amount CCS). of energy it requires, the levels of CCUS is a proposal to “store” captured CO2 in water consumption usage for goods with varying longevity, such as sparkling some technologies , land usage, water, carbon-based fuels and chemicals, or building materials. The CO2, energy-intensively and the toxicity impacts from and captured, usually re-enters into the atmosphere the disposal of the chemical so it is at best a postponement of the emissions. (see Technology Briefing on CCUS). sorbents used. In addition, safe The fossil fuel industry is attracted to DAC and long-term CO2 storage because the captured CO2 can be used for cannot be guaranteed. Enhanced Oil Recovery (EOR), which means more fossil fuels will be extracted and more CO2 is emitted. The company commissioned its first plant All these techniques (CCS, CCUS, DAC) are in 2017, in Hinwil, Switzerland and is participating in several research projects.“ especially of interest to fossil fuel industries, which are their main investors, because they According to Climeworks, the Hinwil plant help to justify continued extraction and use of captures about 900 tonnes of CO2 annually and dirty energy sources. This implies the continued delivers parts of the captured CO2 to a nearby devastation of poor communities around the greenhouse for CO2 fertilisation. About world, with acute environmental justice, health 600 tonnes of CO2 are transported by truck to and ecomonic impacts, while having little the Swiss production facility of Coca-Cola’s evidence it can address the climate crisis at the sparkling water brand “Valser”. scale required. Climeworks collaborates with several companies to develop and produce synthetic fuels manufactured from captured CO2, among Actors involved them the Norwegian company Nordic Blue Several companies and research institutions Crude AS as well as a joint project of the Italian are working to commercialize and advance DAC oil group ENI and the Swiss spinoff Synhelion. technologies. The sector receives private and Climeworks has been supported with more than public investments; double-digit million € 50 million in public and private grants.7 amounts are not uncommon. The private investors include in particular, but Carbon Engineering Ltd., a company founded by not exclusively, the fossil fuel and mining sector, David Keith (Harvard University) commissioned among them Australian oil company BHP, Bill a pilot plant in Squamish, Canada in 2015, that Gates (who has major investments in oil captures about a tonne of CO2 a day. transportation), the autoindustry, Chevron In 2017, the plant was connected to a fuel Technology Ventures, ExxonMobil, the Canadian synthesis platform, aiming to produce synthetic tar sands mega-investor Murray Edwards, transport fuels, based on the captured CO2 and Occidental Petroleum and Shell. Most public hydrogen. The company has raised more than funding to the DAC sector has been provided by CAD 100 million from multiples private the USA, the European Union (EU), Canada, investors, including oil and mining companies, Switzerland and Norway.5 (Chevron, Occidental Petroleum and BHP) and Many DAC companies are spin-offs from public sources and plans to commission a larger research institutions.6 Climeworks AG, a spinoff DAC plant in cooperation with Oxy Low Carbon of ETH Zürich, is the company with the most Ventures in 2023. The captured CO2 will be used for EOR, which means more fossil fuels and DAC plants so far. 8 more CO2 emissions. GEOENGINEERINGMONITOR.ORG Analysis and critical perspectives on climate engineering [email protected] Many of the marketing schemes for Direct Air Capture – which would use vast quantities of green energy – involve likely creation of new fossil fuel emissions. Illustration by Anja Chalmin / ETC Group The US-based company Global Thermostat has The Dublin-based company Silicon Kingdom operated a pilot DAC plant in Menlo Park, Holdings plans to commercialize DAC California, since 2010. In 2018, it opened its first technology developed at the Arizona State commercial plant, capturing 4,000 tonnes of University’s Centre for Negative Carbon CO2 per year, in Huntsville, Alabama. In 2019, the Emissions and plans to “plant” 1,200 mechanical 10 company signed a joint development agreement trees for CO2 capture. with ExxonMobil to study the scalability of The world’s largest research program on DAC is Global Thermostat’s DAC technology. As of this the EU-funded pan-European research project writing, the company has raised more than CarbFix, led by Reykjavik Energy. The project US$ 70 million in funding.9 combines DAC with CCS and involves capturing Worldwide, there are more than ten other CO2 and H2S at Reykjavik Energy’s Hellisheidi initiatives to further develop and market DAC Geothermal Power Plant, nearby Reykjavik. technology, among them the Finnish Soletair The CO2 is dissolved in water under pressure, Power. The company developed a technology and the solution is injected into basaltic that combines DAC, an electrolyser for formations nearby the plant, at 400 m to 800 m hydrogen production, and a synthesis reactor depth, with the aim of storing the gas in mineral for hydrocarbon production and commissioned form in the bedrock. The European follow-up its first demonstration facility in 2018. The US- project GECO (Geothermal Emission Control) is based company Infinitree LLC develops a CO2 conducted to deepen and further develop the capture system for use in greenhouses. CarbFix results at five demonstration sites throughout Europe.11 GEOENGINEERINGMONITOR.ORG Analysis and critical perspectives on climate engineering [email protected] In the USA, larger research initiatives are due to A modelling exercise looking develop after the US congress passed the “Sea Fuel Act of 2019”, directing the U.S. Department at the impact of DAC on climate of Defence to implement a program on DAC. The stabilization efforts predicted first phase (2020-2023) involves research and “that it would postpone the timing development, followed by testing DAC in demonstration projects (2024-2026).12 of mitigation (emissions In Canada, two larger research projects began reductions) and allow for a in 2019: The Pacific Institute for Climate prolonged use of oil, impacting Solutions is funding a DACCS (DAC+CCS) project positively on energy exporting with plans to design a floating platform that would capture CO2 from ambient air and inject it countries. This is of course under the seafloor for storage. Natural similar for many geoengineering Resources Canada and industrial partners are financing a DAC project with the objective to technologies and manufactured mineralize CO2 in mine tailings, and trials will be consent for further fossil fuel use conducted at a nickel mine in British Columbia. is one of the main dangers DAC and other Carbon Capture Impacts of the technology The main problem with DAC, as with CCS and schemes pose.
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