If you burn stuff, it liberates heat and pollutants. If you use an air conditioner, you pump the heat in your house outside, and you add extra heat outside whi

If you burn stuff, it liberates heat and pollutants. If you use an air conditioner, you pump the heat in your house outside, and you add extra heat outside while pumping it. Its that "extra bit" that multiplied by millions is what causes wide area effects.