Yes. I studied Ag in college in the early 80s. Warming was old hat back then. The prof warned us not to expect the unusually nice weather of the 20th century to continue, it wasn't normal by historical standards. The 18th and 19th centuries were really bad, very cold and unpredictable weather. Clearly the weather is warmer now than in the recent historical past.
The questions are, is this a bad thing? How warm will it get? Can we stop it, and if we can, do we want to?