Its definently changing, whether you believe in global warming or not, you at least gotta say pollution is bad
As long as the earth has had climate, it has been changing. Agree or Disagree?
The climate has always been changing, as has the composition of the atmosphere (there was a lot more oxygen in the atmosphere at the time of the Dinosaurs for instance). What is remarkable right now is the actual rate of change. The increase in the amount of carbon dioxide in the atmosphere is unprecedented in "normal" times and most of the warmest years on record have happened in the last three decades.
You can argue about the causes if you wish, (and a lot of "vested interests" do) but the facts are as above.