Those who don’t believe climate change is man-made, what happens when we run out of fossil fuels?

I understand your position is that pollution doesn’t significantly hurt either the environment or people’s health, and that clean energy will hurt the economy or in some way reward lazy people; however, you don’t deny, do you, that fossil fuels are a non-renewable resource? Or that we are rapidly running out of them? So, I mean, isn’t renewable energy inevitable? So mightn’t we just as well go ahead and make the transition now since it’s going to have to happen anyway? Just something I was wondering about at work this afternoon.