Earth's climate has been changing since the planet formed and it has been warming -- on and off -- since the last Ice Age, when a glacier more than a mile thick covered most of North America. Despite increasingly hysterical attempts by leftist politicians to stifle debate and punish contrary viewpoints, questions over the impact of human activity on this natural phenomenon are, in my opinion, dubious, political and unconvincing.
Whether or not we chose to impose policies that send our energy prices soaring and impoverish our economy, one thing is certain: the earth will continue to warm and cool as it has for four billion years.