I agree with chopper, it hasn't been proved and I doubt it can ever be proved, that the sole cause of this was human alone. he is correct in saying there are cycles where it gets cooler/warmer and this could be one.

Even if we are contibuting to the problem stopping things that possibily exacerbate the problem would only shave seconds off the 'end of the world'.

Also, the sun will eventually engulf the whole world - so all this effort is in aid of...? WE ARE ALL GOING TO DIE AND THE HUMAN POPULATION WILL CEASE EVENTUALLY. Deal with it