Another thing to remember...all of earth's land was once one giant continent, and ice caps were almost everywhere. The giant continent broke up and drifted apart over millions of years - ice caps formed on the north and south pole regions.
Knowing this, why is it so hard for people to believe that what we are experiencing is a natural part of the earth's life? The glaciers you speak of have been melting for over 100 years while glaciers on the opposite pole are INCREASING.
I just think it's very presumptuous of us to assume it's us causing all this when in the earth's life, we've only been here for the blink of an eye so far.
Do I think we could treat the planet better? YES. But that does not mean I think the US should destroy it's future on a policy that won't make a difference because it WON'T reduce greenhouse gases even a portion of what they claim it will - yet it will cost trillions of dollars to instill.