I watched that documentary by Dr. Brian Cox about nuclear fusion development and in one segment Dr. Saul Griffith tries to calculate how much would World need renewable power sources like wind farms, solar panels, hydroelectric generators etc. to substitute oil use completely in like 20 years and he came up with impossible numbers, so that in the end he said "Nuclear fusion would be a jail free card for humanity." So I was wandering how much nuclear fusion power plants would you need to substitute current electrical consumption in the world? Would it be enough something like five fusion power plants for the whole Europe? But then I presume you would expect to use the power to make methanol to substitute oil use for cars and other vehicles.