Predictions, Global Warming, Global Cooling, Climate Change - Just How Wrong Environmentalists Are: Today, we talk with Walter Williams on the very inaccurate scare tactics the Environmentalists use and how they are using them to their political advantages. Environmentalists haveÂ been way off. It started out during the 70's, the warning was about global cooling. Then they changed it to global warming. Now they donât call it global warming anymore because they realized how wrong theyâve been, now they just call it climate change.