Climate change is not really at issue; with 90+% of scientists agreeing, that's about as settled as you get.
The issue is "pay now or pay later".
There will be a cost to moving from fossil fuels to renewables; offset over time by reductions in health care and expanding tech, engineering and infrastructure opportunities.
Or we pay later in damage control; war, famine and (perhaps) massive human migration. These things all exist...it's just a matter of scale...