Of course the climate is changing because Americans are lavish with their use of the worlds energy supply. Don't ya know we only have 2% of the worlds supply of oil and are using 75% stolen from other people. How else could Americans be guilty of raising the temperature on Mars and melting the ice caps there?
Climate change is a catch all to describe anything undesireable happening in the world. It also brings a lot of federal dollars to the town criers for studys. Otherwise, they would have to do honest work for a living and they need to pay off their gov't college loans, don't they?