We've spent what the last 50-100 years affecting the climate significantly...and we think we can stop/reverse it in how long? Just because we wish it, does not mean we can materially affect it in a relatively short horizon.

Beyond the idea that we can somehow reduce our current impact, the human population will continue to increase to what, up to 11-13 billion by 2100. Those people will need food, water, goods and services. I won't be around to see year 2100, but I venture to say it's going to be warmer than it is today and there's not a damn thing we can realistically do about it.