[gives some scope into the idea of the media/government needing a topic that will SCARE the populace.]
Well, Global Warming is kinder and gentler than chopping off heads and tossing them down the steps of the pyramid.
Besides, if the sheeple were not terrified then who'd by all those sleeping medications advertised on late-night TV?
Yes, without fear, the sheeple might acquire the ability to study the movements of the planetary bodies for themselves, and, having figured out the REAL reasons why the sun goes dark during an eclipse, they might get very pissed off, climb the steps of the pyramid, and kill the priests.
Can't have that. Not good for business.