Earth's climate today is very good, except that we need more carbon dioxide in the atmosphere. We have been at CO2 levels so low that plants could stop growing if it goes lower. If the concentration of atmospheric CO2 goes below 150 ppm plants stop growing and civilization disappears. Two terrible ideas are leaving fossil fuels in the ground and sequestering atmospheric CO2. It is not our enemies who are trying to do this. It is our own leaders.
