How much CO₂ can DAC actually remove at scale?
Direct air capture can remove billions of tons of CO₂ per year, but the scale required for meaningful climate impact demands a wartime-like mobilization. One study modeled an emergency DAC program with annual investments of 1.2–1.9% of global GDP, finding it could remove 2.2–2.3 billion tons of CO₂ per year by 2050, rising to 13–20 billion tons per year by 2075 [7]. To put that in perspective, global CO₂ emissions from fossil fuels are currently about 37 billion tons per year, so even the 2050 figure would offset roughly 6% of current emissions. The same study found that cumulative removals of 570–840 billion tons of CO₂ between 2025 and 2100 could hasten the arrival of net-zero emissions to 2085–2095, but warming would still reach 2.4–2.5°C by 2100—well above the 1.5°C target [7]. For China alone, modeling suggests DAC could contribute up to 1.6 billion tons of CO₂ removal per year by 2060, representing up to 60% of the country's projected negative emissions [4]. However, the same study notes that DAC has not yet been demonstrated at anything approaching these scales [4].
What makes DAC cheaper or more expensive?
Cost is the biggest barrier, and it varies dramatically by location, technology, and energy source. A geospatial analysis using global weather data found that the levelized cost of DAC (LCOD) ranges from $320 to $540 per ton of CO₂ in suitable regions, assuming electricity costs of $50 per megawatt-hour [10]. The cheapest locations are cold and dry—because DAC systems perform better at lower temperatures and humidity. For example, one study found that using a sodium-exchanged zeolite (Na-X) adsorbent in cold climates achieved the lowest reported DAC operating energy of 1.1 megawatt-hours per ton of CO₂, with a CO₂ adsorption capacity of 2.54 millimoles per gram—the highest known for air capture [9]. Conversely, about 25% of the world's land is too cold for part of the year to operate DAC efficiently [10]. Another study showed that as air temperature rises from 35°F to 95°F, the CO₂ capture rate in a liquid-solvent system increases from 23.2% to 46.8%, meaning warmer climates actually improve performance for that specific design [1]. Expert surveys reveal that DAC costs are expected to decline steeply from current levels, but estimates vary widely and show no convergence over time, with experts projecting higher costs and lower deployment than the International Energy Agency's net-zero scenarios [5]. A key cost driver is the solvent or sorbent itself: producing solid sorbents like polyethylenimine-silica (PEI) for DAC could increase total energy system costs by up to 6.5% at high consumption rates, while liquid solvents like potassium hydroxide have smaller but still significant impacts [2].
Where does DAC work best, and what are the trade-offs?
DAC's performance is highly sensitive to regional climate, energy infrastructure, and policy support. Cold, dry regions like Canada, Alaska, Greenland, and Antarctica offer the lowest operating energy for solid-sorbent DAC, with Na-X zeolites achieving record-low energy use of 1.1 MWh per ton of CO₂ [9]. However, very cold temperatures for extended periods make about a quarter of global land unsuitable for year-round operation [10]. For liquid-solvent systems, higher temperatures improve capture rates—from 23.2% at 35°F to 46.8% at 95°F—but also increase energy demand for solvent regeneration [1]. The energy source matters enormously: an emergency DAC program is most cost-effective when using hydropower or natural gas with renewables, because fully renewable systems have low load factors that prevent efficient amortization of capital-intensive plants [7]. In the aviation sector, DAC-based synthetic fuels could achieve climate neutrality at lower cost than an emit-and-remove strategy, but only if cheap renewable electricity (€0.02 per kWh) is available [6]. For maritime shipping, using DAC-captured CO₂ to produce e-methanol could reduce the sector's global carbon emissions by half by 2050, but this depends on scaling up renewable hydrogen production [8]. Policy frameworks are also critical: a study of Canada's emerging DAC policy regime identified six overlapping domains—climate mitigation, energy and resource constraints, carbon storage infrastructure, financing, technology availability, and social acceptability—that must be addressed simultaneously to enable scaling [3]. Without coordinated policy, even technically feasible DAC deployment will stall.
About These Sources
This answer is built on 10 peer-reviewed studies — published from 2021 to 2025, 6 from 2024 or later, 6 in Q1 journals, collectively cited 411 times — selected as the most relevant from 10 studies that passed quality screening, drawn from 44 papers retrieved from a database of over 500 million.
Sources used in this answer
Direct air capture with amino acid solvent: Operational optimization using a crossflow air‐liquid contactor
A lab-scale DAC study using a potassium sarcosinate solvent and a 3D-printed Gyroid packing found that increasing air temperature from 35°F to 95°F raised CO₂ capture rate from 23.2% to 46.8%, while the Gyroid design reduced pressure drop by up to 77.8% compared to conventional packed beds.
Accounting for carbon capture solvent cost and energy demand in the energy system
Modeling of solvent/sorbent production for DAC found that solid sorbent (PEI) consumption could increase total energy system cost by up to 6.5% at high usage, while liquid solvents (KOH, MEA) had smaller effects; scaling up material production for MEA and PEI would be substantial.
Scaling carbon removal systems: deploying direct air capture amidst Canada’s low-carbon transition
A country-level policy analysis of Canada's DACCS regime identified six issue domains (climate mitigation, energy/resource constraints, storage/transport, financing, technology, social acceptability) and found gaps in policy coverage that could hinder scaling.
The role of negative emissions in meeting China’s 2060 carbon neutrality goal
Modeling China's 2060 carbon neutrality goal showed negative emissions could offset ~3 GtCO₂/year, with DAC contributing up to 1.6 GtCO₂/year (60% of total negative emissions), but noted DAC has not been demonstrated at required scales.
Expert insights into future trajectories: assessing cost reductions and scalability of carbon dioxide removal technologies
A survey of 34 experts (21 DACCS, 13 BECCS) found that DACCS costs start higher but decline more steeply than BECCS, yet expert estimates varied widely with no convergence over time; combined 2050 capacity was only ~25% of IEA's net-zero scenario projection (1.9 GtCO₂).
The role of direct air capture in achieving climate-neutral aviation
A techno-economic assessment of DAC for aviation found that synthetic fuels from DAC could achieve climate neutrality at lower cost than an emit-and-remove strategy if cheap renewable electricity (€0.02/kWh) is available, but the cost advantage weakens under demand reductions or CO₂-only targets.
Emergency deployment of direct air capture as a response to the climate crisis
Modeling an emergency DAC program with 1.2–1.9% of global GDP annual investment found it could remove 2.2–2.3 GtCO₂/year by 2050 and 13–20 GtCO₂/year by 2075, but warming would still reach 2.4–2.5°C by 2100; DAC is most cost-effective with hydropower or natural gas plus renewables.
Direct air capture-assisted sustainable fuel solution in maritime sector: a carbon footprint perspective
A carbon footprint analysis of DAC-based e-methanol for maritime shipping predicted that scaled-up usage could reduce the sector's global carbon emissions by half by 2050, using DAC-captured CO₂ and renewable hydrogen.
The potential of direct air capture using adsorbents in cold climates
A study of temperature vacuum swing adsorption DAC in cold climates found that Na-X zeolite achieved the highest known CO₂ adsorption capacity from air (2.54 mmol/g) and the lowest reported operating energy (1.1 MWh/ton CO₂), making cold regions like Canada and Greenland promising for DAC.
Geospatial analysis of regional climate impacts to accelerate cost-efficient direct air capture deployment
A geospatial analysis using global hourly weather data found that cold, dry regions have the best DAC performance; about 25% of global land is unsuitable due to very cold temperatures; levelized cost of DAC ranges from $320–$540/tCO₂ at $50/MWh electricity cost.