I agree that we should still try to reduce our reliance on fossil fuels even if global warming is bullshit. Which I don't think it is. Everyone probably got too ahead of themselves and got a little paranoid, but I still think we are contributing to it. CO2 in the atmosphere traps heat, that's obvious. We produce C02 with almost everything we use, so there is obviously going to be more in the atmosphere. Methane also does the same, water particles etc.
But even if we just pretend we aren't damaging Earth at all, we know our atmosphere is shit, just go in to any major city and you instantly start to feel ill.
We are probably damaging ourselves due to all the crap in the air. This is good enough reason to stop using fossil fuels and start using renewable and clean sources of energy.