I'm not concerned about global warming cooling climate change. Weather happens.
Nope, what concerns me is that someone -think Bill Gates, or Richard Branson - may try to *do* something about it ... and really screw things up.
Ice ages have lasted a hundred thousand years or so with 10K-15K warm periods in between. We are 12K years into the latest warm period, so we are kind of due to go back to normal - cold.