Machines that pull carbon dioxide directly from the atmosphere are becoming more practical and affordable. Several large-scale facilities are now operational, but the technology faces significant challenges.
How It Works
Direct air capture (DAC) systems use chemical processes to absorb CO2 from ambient air. The captured carbon can be stored underground permanently or converted into products like synthetic fuels or building materials.
The Scale Problem
Current DAC facilities capture thousands of tons of CO2 annually—impressive for a new technology but tiny compared to the billions of tons humans emit each year. Scaling up will require massive investment, cheap clean energy, and significant cost reductions.
Proponents argue DAC is necessary because some emissions are nearly impossible to eliminate. Critics worry it distracts from the more urgent work of reducing emissions at their source.
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