Plant trees. I wonder why this is not incentivized more, would be the ideal low-tech way to sequester CO2 and at the same time improve the landscape.
Most sources I've read suggest that planting even very large numbers of trees would not do much to offset global warming, as mature forests have very little net CO2 sequestration effect. I've also read that the heating caused by the increased albedo of tree leaves offsets even the small gains from this one-time absorption.
Intuitively, it's fairly easy to see why any scheme for removing CO2 from the atmosphere is doomed to failure -- the concentration of CO2 in the atmosphere is fairly low and you're working against entropy to remove it. This leads to very ...
Mine was to work tax policy to incentivize companies to make all their packaging shiny and white, incentivize people to litter, and disincentivize everybody from recycling.
My friend's was to use a giant rocket to push the earth farther away from the sun