Senoufou wrote: So which fuels are the worst for causing global warming?

The fossil fuel that generates most CO₂ for a given amount if heat - or electricity generated by such a fuel. And that's coal. Wood - or 'biomass' - even old fencing - is not a fossil fuel. Trees absorb CO₂ when they grow so over 50 years or so the CO₂ released by burning wood should be reabsorbed - provided we replant the trees. Indeed, the hotter it gets the more trees will grow. The world may end up reforested in the long run - like in the carboniforous period when dinosaurs existed. But in the long run we'll be extinct.

Senoufou wrote: And what about that famous hole in the ozone layer

That was unrelated to global warming. Ozone shields us from radiation which causes skin cancer.