I believe that the Earth is getting warmer through both natural and man-made processes. But, the US is contributing relatively little to the man-made part per-capita compared to other nations. Regardless, I simply don't buy into the global warming hysteria. If the Earth warms 5-10 degrees, all it will mean is more pleasant winters. Florida and NYC aren't going to sink below the sea. If places like that were, we would have started to see high-profile examples of that already, as the Earth has warmed several degrees.
TL/DR: Global warming is real, but no big deal.
It's not about "not buying" into the consequences. You can't tell the future by common sense and gut alone. Carefully researched models point towards Florida and Chesapeake Bay sinking deep into the sea by 2050. By the way, enjoy heat waves? There's going to be a lot more of those in the summer, specially in Europe, not just pleasant winters.