It's important to accurately distinguish between threats that are real verses threats that are theoretical. Islamic terrorists want to kill us. They have demonstrated their sincerity and their skill at it. Granted, they represent a statistically minimal threat, but they actually do want to kill us and our loved ones.  And, apart from the explosives and deadly weapons part, they also want to enslave us and choose our religion for us. Some may object to that, as well. Wisdom suggests we prepare for rare but consequential threats before they are on our doorstep. 

Climate change, however, may not pose any actual threat. It will be awkward, uncomfortable, economically disruptive, but the climate has varied throughout history. We  seem to be on the verge of a warming period. Why is that scary? We'll grow grapes and make wine in Greenland again. Low-lying cities will have to migrate. We'll use more sunscreen. Like, man, who cares?