Obama enters snowy climate debate in Nevada

The idea is, is that as the planet as a whole gets warmer, you start seeing changing weather patterns, and that creates more violent storm systems, more unpredictable weather.  So any single place might end up being warmer; another place might end up being a little bit cooler; there might end up being more precipitation in the air, more monsoons, more hurricanes, more tornadoes, more drought in some places, floods in other places.

So I just -- that's one aspect of the science that I think everybody should understand.