Fossil fuels are going to run out. This much we know. No one is entirely certain when they will run out exactly, but we know it will happen eventually.
Some estimates suggest we have about 70 years of coal, gas and oil left; the fossil fuel industry itself insists that we have significantly longer. But everyone agrees they will run out in due course.
So how will the world be powered when we can't rely anymore on fossil fuels? Why with volcanoes, waves, wet wood and solar power from space.
To compensate for the decline of traditional energy sources, researchers around the world are developing innovative new technologies that -- between them -- may provide a long-term solution to our rapidly growing energy needs. Some are familiar, some may seem far-fetched, and some could potentially pose as much of a threat to the environment as fossil fuels themselves....
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