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As I understand the physics of it, to capture CO2 from the air requires energy. The problem then is - where are you getting that energy from? For CO2 capture,
by casenmgreen 4y ago
As I understand the physics of it, to capture CO2 from the air requires energy.
The problem then is - where are you getting that energy from?
For CO2 capture, it must be green energy - not emitting CO2 itself - and you need to capture CO2 at volumes great enough to have a global impact.
Doing so at such volume requires massive development of green energy sources - and given we're not even building enough green to replace ditry (currently globally, we're building lots of green and lots of dirty, too), the idea we will then additionally build another civilization-scale supply of green energy for CO2 capture seems improbable.
- raincole 4y ago> Doing so at such volume requires massive development of green energy sources - and given we're not even building enough green to replace ditry (currently globally, we're building lots of green and lots of dirty, too), the idea we will then additionally build another civilization-scale supply of green energy for CO2 capture seems improbable. This is entirely depending on whether you think nuclear is "green enough". But anyway the original article is bs.
- nazgul17 4y agoI think the energy required to capture co2 is needed to run fans that force the air through filters. The filters themselves are passive.
- casenmgreen 4y agoI may be wrong, but I think the filters are not passive. There is in fact a chemical reaction going on, and energy (stored in the chemistry of the filters) is being consumed to capture the CO2. There are rocks - concrete does it too - which absorb CO2. This also is a chemical reaction, where the rocks and the concrete are giving up energy to capture the CO2.