Scientists seeking funding and journalists seeking an audience agree: panic sells.
“Global cooling is going to kills us all!” “No, wait: global warming is going to kill us all!”
All that’s missing is a back-and-forth of “You shut up!” “No, you shut up!” That is reserved for those who doubt the need for panic.
http://www.americanthinker.com/blog/2014/08/120_years_of_climate_scares.html