We don't have a warm period, - it's just cosy. The warmer periods never supported intelligent life as well. The climate in the warmer period is thought to have been somewhat violent BTW.
The cold periods were rough, but yet intelligent life was starting to blossom in the last cold one.
And in cold periods, not all the globe was frozen over.
In an accelerated warm period as some are predicting (me not), you will have no life on the planet at all. If it is not just the sun, but a function of high emissions and low vegetation to add, it may however be a situation never occuring before. I'd rather not take the chances.
So naturally, I am all for the western world growing as much fuel as they can. It will balance emissions to some point, lengthen the period untill we run out of oil anyway, and make us less depended on....OPEC as well as Venezuela.....
As for Retro's explaining picture being simple, it still seems to be complicated enough for some on the forum....