This is College Physics Answers with Shaun Dychko. If one-millionth of the hydrogen in the world's oceans were converted into energy, we would have this much energy, converted energy by fusion by the way, so if all of the hydrogen was converted into fusion then -- in other words all the water which has a molecular formula H-2-O was turned into just hydrogen, and then that hydrogen was fused into helium, then the energy released would be ten to the thirty-four joules. One-millionth of that means divided by one times ten to the six. Then we have in one year the world's current energy consumption is four times ten to the twenty joules. So the way I've set it up here you can see the units work out to years and so we have 2.5 times ten to the seven years which is 25 million years of energy being provided with one-millionth of the world's hydrogen in the oceans being fused. Well, that's a long time. The earliest humans evolved about three million years ago so this timescale is much longer than human timescales.