Global warming is simple and not hard to understand at all. Only three things can effect the climate on a global scale, the sun, the earths reflectivity, and greenhouse gas. Global climate change happens when one of these three things changes. What's changed in the last 100 or so years that could alter the earths climate? See how easy it is?
Only three things?
How about Direct Heating?
Put your face under the hood of your car the next time the fan runs or go to the top of a high rise and stand in front of the heat exchangers.
Direct Heating is ignored by the people pushing "global warming" because they are stupid.
Even if Global Warming was proven without a doubt, the fact that they never address direct heating removes all credibility and point instead to an agenda.