I recently watched a TV program on cable about how the earth was formed. It was very interesting. Ice Ages turned to Volcanic heat and back to ice. It's simply a cycle. The beauty is that these cycles take hundreds of thousands of years. In the process, life is altered, changed and born. Plant life is destroyed and reborn. The program said that "global warming" is simply a rest between Ice Ages. I have my down boots and jackets just in case, but something tells me there is plenty of time till the next ice age...........