I truly believe that people who don't see how global warming is effecting the environment are wearing blinders.  It is not the ONLY factor, but it is definitely a MAJOR one.  It is not logical to compare an ice age from twelve billion years ago to any potential one in the future, because the environment/atmosphere then was not in the condition that it is today.  And it is in the condition it is today because of human-caused pollution.  We Americans are responsible for our fair share of it, and our nation needs to be much more globally responsible than it is.  We just don't want to give up our cars and gas-guzzlers, and other things that could be cut down on.  Heck, for that matter, what about all this trash we produce?  Recycling should be mandatory, but its not.  Our nation tends to behave a bit like an adolescent, in far too many cases.  "I want it, and I want it NOW!"  "No one can tell me what to do!"  "I know everything!"  We really need to get over ourselves.  I love the great U.S. of A., and that is why I wish we'd grow up.