Comments

While it's true that the equipment needed to sustain nuclear fusion is expensive, that is not the main obstacle to having widespread fusion as a power source. The main problem is that with current technology we have to put more energy into creating fusion than we get back from it. Plus to my knowledge scientists have been unable to sustain a fusion reaction for more than a very brief period of time. This is because the superheated plasma they use to create fusion is so hot no material could come in contact with it without instantly vaporizing. This makes it extremely difficult to contain. They are trying to solve this problem by containing the plasma magnetically so that it doesn't actually have to come in contact with anything. The problem they are having however, is that the magnetic fields they are using are imperfect and can only hold the plasma for a short time before it manages to escape. This of course causes the reaction to automatically stop before the whole system is damaged from leaking plasma. A better magnetic field must be created before this problem can be overcome. That and the first reason I listed plus several others I'm sure is why we do not yet have a fusion powered world.