Energy can neither be created nor destroyed, can just be converted from one form to other! If global warming is really happening it only means we are not consuming heat at the same rate we are generating it... or now somanythings are getting converted to heat energy.

I used to think we were very very hot fireball after big bang and now gradually cooling down. If that is the case we are actually supposed to continue that trend... i think there has been terrible mistake in calculating the temperatures during last few hundred... thousand years... or it is just normal phenoman which is highly exaggerated just because we have now been technically enough advanced to be able to measure and observe the trends in earth temperature which might have been ignored for thousandsof years. all the proofs and figures are actually our attempts to fill in the gaps of our assumptions...