Comment by crimsonalucard1

Doesn't the net CO2 in the air increase?

So you harvest CO2 to into fuel. That fuel is burned and the CO2 is released back into the air. So net difference is zero.

But to harvest the CO2 you needed to generate a high amount of heat. That's extra CO2. So net CO2 is more.

It depends on the cost of harvesting that CO2.