These climate cranks are literally mad. There is no reasoning with them, and the wronger they are, the more the will to believe becomes stronger. From:

When dealing with a fundamentalist religion it does no good to point out the facts and data about improving environmental conditions, or the reasons behind these happy trends (namely economic growth, open markets, and technological advance), or the sorry record of environmental doomsday predictions ever since the first Earth Day 51 years ago. This one may be my favorite:

Peter Gunter, a North Texas State University professor, wrote in 1970, “Demographers agree almost unanimously on the following grim timetable: by 1975 widespread famines will begin in India; these will spread by 1990 to include all of India, Pakistan, China and the Near East, Africa. By the year 2000, or conceivably sooner, South and Central America will exist under famine conditions….By the year 2000, thirty years from now, the entire world, with the exception of Western Europe, North America, and Australia, will be in famine.”