What signs of 'global warming' have you witnessed for yourself?

None. Only climate change and fluctuations which I believe has been happening since the beginning of time. No-one living today was on earth 2,000 or 500 or even 200 years ago, so it's hard to compare with any rock solid legitimacy. I believe there will be four seasons until the end of time and earth as we know it.

I also agree with @hippyjoe1955 and @questionWeaver.