David Buzzard/Shutterstock Save for later Print Download Share LinkedIn Twitter Direct air capture (DAC) is a promising new technology that could prove to be a critical tool in scrubbing planet-warming gases like carbon dioxide from the atmosphere. It is foundational to the energy transition strategy of Occidental Petroleum, which looks set to launch the world’s biggest DAC project as soon as 2024, with other oil firms also exploring it with keen interest. Yet with so few projects in existence today, major questions linger over the long-term viability of widely deploying the technology — with costs needing to fall dramatically and uncertainties abounding about how to scale it up.