But hey ho, you'll have enjoyed your large car
Ah, so because I disagree with you I have a large car? That's interesting.
Do I eat babies and put cats in wheelie bins too? Just because I disagree with you? 
What makes you assume that Tramb?
Anyway - how warm was it when the dinosaurs (you do believe in them right?) were wandering round?
That's right - very. That's why you can find fossils of tropical ferns in the UK.
And then what killed them? Oh, that's right - an Ice Age. That's why you can find fossils of Mammoths in the UK.
What do we still have the slowly melting remnants of hanging around?
That's right too - glaciers, from the Ice Age.
Still with me? I can't type any slower if you're not I'm afraid.
So, we're still at the tail end of the last Ice Age. By the time it finishes the Earth may well be back to "normal" dino-suitable temperatures.
Why on earth would you think the temperature would't continue to change just because you don't like cars? We may change it by a century or two, but as I said - the Planet will be fine & will continue to toddle along doing perfectly well without us, probably rules by Ants in Bowler Hats or somesuch.
And, BTW, my kids will be just fine thanks, as will their children. So please, take the hessian shirt off, have a drink & lighten up for fucks sake. 
You're Welcome....