Ponder this one absolute fact. Never were there over 6 billion homo sapiens in habiting this planet.Draw your own conclusions. Animals didn't deforest great areas.Methane while present, wasn't present in this amount, and CO2 was a needed thing for plant growth. Sure we can count more polar bears, because men couldn't fly over the poles a 100 yrs ago.Maybe it is natural, and if nature follows its course, nothing we do can stop it. anyone know how many meteors are out there, big enough to end it all?Like Alfred E Newman used to say " what me worry'?