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A comment on The impact of direct air carbon capture on climate change. Parent comment

Re:The impact of direct air carbon capture on climate change by rb808 on Thursday November 21, 2019 @10:28PM (#21602170)
> So it only makes sense to spend energy on sucking CO2 out of the atmosphere, once you've already de-carbonised everything which you possibly can.

Not necessarily. I'm thinking of cold polar winters with no wind and no sun, people burning fossil fuels to stay warm. Meanwhile in deserts solar panels powering carbon capture machines to reverse the greenhouse gases back again. Maybe even the carbon capture creates synthetic coal which can be shipped to the cold regions.

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Re:The impact of direct air carbon capture on climate change by m4rtink on Friday November 22, 2019 @09:36AM (#21605874)
Yeah, you can basically use the atmosphere as a chemical battery.

Also, a better example than heating homes with coal is aircraft. Long distance air plane travel is so far only doable via fossil fuels due to their energy density. And while you can run a electric line to a house and heat it with electricity, this is not possible for long range aircraft.

So the idea is you use hydrocarbons to run aircraft and then capture the CO2 produced and turn it into more hydrocarbons to run your airplanes. This of course requires clean energy source to work, but is perfectly doable. :)

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