Fifty years ago, I helped organize Earth Day #1 programs on my college campus, calling attention to serious pollution problems that afflicted much of the USA. Over the ensuing decades, laws, regulations, and changed attitudes, practices and technologies reduced most of that pollution, often dramatically. I didn’t buy into the 1970 end-is-nigh, doom-and-gloom, billions-will-die hysteria that Ron Stein and Ron Bailey summarize, including the manmade global cooling crisis. I don’t buy it today, either – certainly not this year’s Earth Day focus on the alleged manmade global warming crisis, also blamed on emissions of carbon dioxide, the same gas that...