Global warming

So, first of all that comes to mind is global warming, this problem is known to everyone because people see a real threat in it.
Few interesting links:
http://www.conserve-energy-future.com/StopGlobalWarming.php
http://globalwarming.com/
Greenhouse gases are actually partly responsible for this, though there are a lot of theories including those that say that greenhouse gases have very little to do with it.
Links about greenhouse effect:
http://www.physicalgeography.net/fundamentals/7h.html