When I first heard the term "global warming" sometime in the mid 1970s, I was curious, at first, and then became absolutely convinced that this was a certainty if we humans continued to consume carbon based fuel sources.

Millions of years ago, when our Mother Ship was very young, the atmosphere was, scientists say, full of all sorts of gases, including huge amounts of CO2 and was very toxic to life AS WE KNOW IT NOW. It took most of the succeeding MILLIONS of years for plants and animals to process and use most of that CO2, transforming it, with their dead bodies, into coal, oil, peat..... And now in just a few hundred years we are harvesting that coal and oil at an alarming rate and churning a vast amount of that carbon back out into the atmosphere as CO2. What it took millions of years to do, we are undoing so fast that I fear it is almost too late to "put on the brakes."

--G S Callendar in the 1930's, actually, I think, coined the term "greenhouse warming." By the 1950s, at Callendar's urging a few scientists really began to look into the issue of increased atmospheric CO2 causing a greenhouse effect--or a gradual increase in global average temperature. "Google" Callendar and see what you find! He was shouting and few people listened!