Fossil fuels are not a long-term energy solution in any case, so it makes more sense to attack the problem from that angle. And I suspect the answer is that it

Fossil fuels are not a long-term energy solution in any case, so it makes more sense to attack the problem from that angle. And I suspect the answer is that it's not cheaper. I'm unaware of any cheap, scalable, safe method of reducing CO2 levels. It's difficult to conceive of a practical solution to global warming that doesn't involve drastically reducing the ongoing CO2 output. How are you going to balance out 30+ billion tonnes of carbon dioxide per year?