I have a question regarding the Resource Wars that lead up to the Great War of 2077.
So, I was reading the article that the Fallout Wiki has on the Resource Wars (http://fallout.wikia.com/wiki/Resource_wars), which says that these wars started because the world's supply of oil and other fossil fuels was starting to dry up. But, if nuclear power has become widely available in the Fallout universe (as evidenced by the existence of fusion-powered cars like the Corvega and of fusion-powered weapons like the laser and plasma rifles), then why is there such a mad rush for oil? Fusion power could provide almost unlimited clean energy; the primary fuel that is required is hydrogen (or, rather, various isotopes of hydrogen), which is the most abundant element in the entire universe (it's in water!).
It seems to me that there is an inconsistency here in that the Resource Wars are described as being massive, continent-wide conflicts over oil, but they occur in a world that should no longer need to rely exclusively on fossil fuels. At least, the world of Fallout should only be minimally dependent on oil. Maybe poor countries have yet to make the transition to nuclear power by 2077, but since poor countries tend to only use small amounts of energy anyway, their demand for oil should also be fairly small (in the grand scheme of the entire world economy). Once the major "consumer" nations (the USA, China, the USSR, the Western European nations, and possibly India) have made the switch to nuclear power, there should be no need to start world wars over oil.
Can anyone explain this or tell where my reasoning or information is wrong?