In WWII the USA spent about 40% of GDP on the war effort. Direct air capture of all carbon emissions with current tech would only cost about 20% of GDP[1]. So i

In WWII the USA spent about 40% of GDP on the war effort. Direct air capture of all carbon emissions with current tech would only cost about 20% of GDP[1]. So if it were a big enough priority, we could be doing it now. Sure reducing emissions and or developing better tech would make that much cheaper, but even the worst case scenario with current tech seems affordable if you take it seriously as an existential risk. [1] my own rough calculation based on looking up the current market cost of the already commercially available carbon capture technologies, not considering challenges or economies of scale