Some experts predict that global oil production will peak around the year 2015. We'll talk about a fuel that might replace oil. Photo courtesy of Daimler Chrysler Danmark .
Experts debate just how much untapped fossil fuel there is left in the world.
What's more, burning fossil fuels produces undesirable pollution. That sounds harmless enough, especially because the hydrogen would have come originally from water somewhere else which some electric plant would have electrolysed water and generated the hydrogen. So it's simply carrying hydrogen around as a way to carry energy around. And most people think that's going to be an exciting thing, but the chemistry isn't in place yet, but it's getting there. And so that'll be a challenge.