Fuel depletion will not send the human race extinct. We survived without it before, we will survive without it again. Also, oil is not the only energy source, for cars or anything else. There are plenty of perfectly good alternative energy sources, but in general, the patents have been bought up by existing oil companies so that they can maintain a monopoly on the energy market.
If we do die in a nuclear war it will still be 'natural' as it will be effected by us and we are part of nature. However, I really don't think this will happen. Crazy dictators like Saddam Hussein or George Bush tend to have sociopathic or psychopathic personalities. This means firstly that they have such an over-inflated sense of self-importance, that they will not do anything that would seriously jeapordise their own existence. Secondly, they tend to be bullies and will only pick on people they know can't fight back. Take, for example the fact that the Alliance just attacked Iraq who they knew had no WMDs, but just went very quiet and pale about Korea who are literally parading their WMDs around. Nobody is going to nuke someone who can nuke them back. As such, any nuclear attacks will not result in the complete destruction of humanity.
As for the meteorites, now they are tough. If we get hit by those, we're fucked, but that's a big if: It really is very rare. As for them pulling us out of alignment, could you state a source for this? I haven't done the maths, but I should think it would take a lot of energy to liberate the Earth from the Sun's orbit.
Now to answer the title of the thread, I don't think 'The World' is doomed. The human race? Yes, species come and species go, but we're still relatively new so the odds are in our favour for the moment. The Earth? Yes its going to get engulfed by the Sun sooner or later, but a lot more like later than sooner.
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"No one was behaving from very Buddhist motives. Then, thought Pigsy, he was hardly a Buddha, nor was he a monkey. Presently, he was a pig spirit changed into a little girl pretending to be a little boy to be offered to a water monster. It was all very simple to a pig spirit."
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