Even if Global Warming were an existential threat to mankind, I'd still have a hard time giving a shit about it.
1. There's nothing I can do about it.
2. I'll be dead long before it has any tangible effect on my existence.
edit: for the record, I do not believe it's a threat to our existence. If humans are the cause of global warming then the solution is to cull 90% of the human population. If it gets as bad as you think it will, then essentially nature will handle the culling for us either by famine or war or both. If that doesn't happen, then it wasn't that big of a problem.
This.
If you believe its a natural cyclic event, then its only mans ego that things we can change planetary climate cycles
If you believe its caused by man, then precisely nothing can be done until you start eliminating humans. and we arent.