Climeworks: a technology to reverse climate change

Boom in negative emissions

Removing CO2 from the air is what scientists call negative emissions. On paper, there are several ways to achieve this. The easiest way is to plant forests. Trees are natural carbon sinks, capturing CO2 through photosynthesis and storing it in their trunks, branches and roots, as well as in the soil.  But not enough land area is globally available to capture between 100 and 1’000 billion tons of CO2 with trees alone. Also, the permanence and verification of the removed CO2 cannot always be guaranteed since wildfires or deforestation can destroy trees and release the CO2 back into the atmosphere. A second possibility is based on bioenergy. This consists in cultivating fast-growing plants. But here again, more than 700 million hectares would have to be devoted to these crops by 2050, which is unrealistic.

There is a third way that is emerging – using technology to capture CO2 directly from the air and storing it underground (direct air capture and storage). Several companies are exploring this avenue, such as the Swiss company Climeworks, which has developed direct air capture machines that filter ambient air and collect the carbon dioxide before injecting it underground. Climeworks aims to inspire one billion people to remove CO2 from the air. This far-from-ridiculous solution is the brainchild of Christoph Gebald and Jan Wurzbacher, two engineers from the Swiss Federal Institute of Technology Zurich (ETH Zurich).

Climeworks makes carbon dioxide removal a reality

In Iceland this idea has already become reality. In 2017 Climeworks set up a plant that combines direct air capture with a safe and permanent underground storage method, developed by their partner Carbfix. Through natural mineralization the captured CO2 reacts with the basalt rock and turns into stone within a few years. Climeworks made this solution accessible to everyone: in 2019, the company launched its carbon dioxide removal service. Anyone can subscribe to this service and Climeworks removes carbon dioxide from the air in their name.
Interest in carbon dioxide removal solutions is continuously increasing and Climeworks has attracted several corporate customers as well, such as Stripe and Shopify. Businesses play an important role in building a market for carbon dioxide removal and scaling solutions like direct air capture.

In 2020, Climeworks is taking carbon dioxide removal to the next level in Iceland: the company is constructing a new, much larger facility, called “Orca”. Orca will be able to permanently and safely remove 4’000 tons of carbon dioxide from the air per year. It is thus the world’s biggest climate-positive direct air capture plant to date. 

Further applications of direct air capture

Besides safely and permanently storing it, Climeworks’ air-captured CO2 can be upcycled into climate-friendly products such as carbon-neutral fuels and materials. In this particular field Climeworks is involved in several projects and partnerships. For example, in 2020, it became part of the new European consortium Norsk e-Fuel, which aims at making unlimited renewable fuel a reality. Given the world's climate emergency, the two Climeworks founders are confident about the future of their company, which is already applying its solutions in a wide range of areas.

Towards democratization

After these successful implementations of the technology, Climeworks is also attracting the attention of several investors. By raising CHF 100 million in 2020 from private investors – the largest ever investment into direct air capture – Climeworks shows just how much interest the technology is generating. This sum enables the company to further scale and optimize its technology and make it accessible to even more stakeholders; people, businesses and organizations alike. Climeworks has a detailed scale-up roadmap in place and a longer-term cost target of USD 100 per ton of CO₂.