"Consensus" climate science has for decades assumed that the vast majority of the increase in atmospheric concentration of carbon dioxide (from about 280 parts per million by volume [ppmv] before the Industrial Revolution to about 400 today) has come from burning fossil fuels for energy. On that assumption, "consensus" scientists have alleged that human activity has driven all or most global warming over that time. Most criticism of that thinking has focused on "climate sensitivity"---how … [Read more...]