FAQs and more about direct air capture

Take a look at the questions we are most frequently asked by our community.

About Climeworks

How does Climeworks' direct air capture technology work?

Why do we need direct air capture?

Why don't we just plant trees?

Why not capture CO₂ from point sources, e.g. directly from a smokestack, where the CO₂ concentration is much higher?

How much energy is required to run Climeworks' direct air capture process?

Do Climeworks' direct air capture machines operate better at higher levels of CO₂ in the air?

Is the air really free from carbon dioxide when it leaves the Climeworks CO₂ collector?

What can the CO₂ produced by direct air capture be used for?

Your machines capture carbon dioxide. But how much carbon dioxide is caused by the production, commissioning and recycling of your machines?

How many direct air capture machines have you sold?

About the Climeworks carbon dioxide removal service

Is it safe to remove carbon dioxide from the atmosphere and turn it into stone?

How does Climeworks remove the CO₂ I have subscribed for and how long does it take?

What is the difference between Climeworks' carbon dioxide removal service and traditional carbon offsetting?

Do I get some sort of certificate?

How can I edit or cancel my subscription?

Want to read more?

Discover more about carbon dioxide removal and direct air capture in the following research papers and policy reports.

Scientific Papers

The Role of Direct Air Capture in Mitigation of Anthropogenic Greenhouse Gas Emissions

Direct Capture of CO₂ from Ambient Air

Carbon Dioxide Storage through Mineral Carbonation

Carbon dioxide direct air capture for effective climate change mitigation based on renewable electricity: a new type of energy system sector coupling

The mutual dependence of negative emission technologies and energy systems

Negative emissions: Part 1 - Research landscape and synthesis

Negative emissions: Part 2 - Costs, potentials and side effects

Negative emissions: Part 3 - Innovation and upscaling

Trends in the global cement industry and opportunities for long-term sustainable CCU potential for Power-to-X

Policy reports

IPCC Special Report: Global Warming of 1.5 ºC, Summary for Policymakers

The Role of Atmospheric Carbon Dioxide Removal in Swiss Climate Policy - Fundamentals and Recommended Actions

Getting to Neutral: Options for Negative Carbon Emissions in California

Negative emissions technologies (by Swiss Federal Office for the Environment)

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