The climate doomsayers have changed their tune multiple times from global cooling to global warming and now the final default position "climate change", but the hype and handwringing remains the same.

Here's an article that well characterizes the global cooling hype in the 70s. Take a moment to read it. You see the same formula of doom and call for government action before grim reality sets in was no different 40 years ago than it is today.

http://denisdutton.com/newsweek_coolingworld.pdf