Realists must now sway public opinion firmly against global warming scare President Donald Trump is right to kill the hugely expensive Clean Power Plan (CPP). After all, it only controls carbon dioxide (CO2), which is simply plant food. The Nongovernmental International Panel on Climate Change cites over 1,000 peer-reviewed studies showing that rising atmospheric CO2 enhances productivity of forests and grasslands. Commercial greenhouses run at up to about four times the outside level of CO2 to boost plant growth.