OF COURSE! That's what happens when you drive gas-spewing SUVs and you build factories that throw all kinds of pollutants into the atmosphere:

“A change in our climate is taking place very surely. Both heat and cold are becoming moderate within the memory of even the middle-aged, and snows are less frequent and less deep.”

Oops, sorry, it was Thomas Jefferson who said this. In 1804.He drove a Hummer, right? Planeticidal humans!