Sorry, John, but
(1) It isn't a matter of adjusting to a little bit of climate change. It's a matter of avoiding a ruinous amount of it. There is no getting around it: we simply must rein in, then reduce our CO2 emissions. China, the US, Europe, everybody.
(2) How much it will cost depends on how efficiently we do it. Some reductions are cheap, so cheap they more than pay for themselves. Free and better than free. Installing advanced lighting, insulating homes better, that sort of stuff. Other reductions would be expensive if done with today's tech, but tomorrow's tech figures to be better. Solar, for instance. Still others will be somewhat more expensive than coal, but not way more expensive. That's where we are with wind energy.