The climate has changed since the beginning of time.
It will continue to change until the end of time.
Man has had nothing to do with it.
Only about 2,000 or 3,000 years ago that little piece of land currently known as "Central Park" (the one in Manhattan) was enveloped in a glacier about 2,000 feet thick.
That glacier vanished into thing air about 2,000 years before the advent of the internal combustion engine.