Ok, forget Polar Bears and glaciers. I have never seen either of these things so cant know first hand if they are being harmed by global warming or not.
What I do know is;
When I was a boy we had temperatures as low as 50 below zero where I lived. Snow up to the telephone wires causing us to be snow bound for two weeks.
The coldest I've seen it here lately is around 0 to a few degerees below, and it is now the last day of November and we have NO snow at all.
Furthermore, it is within the last 10 years or so that I have seen, with my own eyes, southern wildlife. Cardinals and Possums, unheard of just a few years ago.
Look at any smoke stack, exhaust from a big truck or bus and realize that we are pumping filth into the air by the billions of tons each year. Look at the history of volcanos. In the past they have caused nuclear winters because their emmissions have blocked out the sun's heat.
Climate change is a natural thing, but we are speeding it up with our "contributions" that are bringing it about.
How anyone with eyes that are connected to a brain can fail to see this is a mystery to me.