Is it time to end biofuels?

As energy prices go sky-high this winter, any source of affordable energy may seem like a welcome reprieve. But does it make sense to be growing crops for fuel that could otherwise be food? This is the conundrum of biofuels. Today on Living Planet, we travel to the US, Kenya and Germany to explore biofuels – how they came about, their promises and drawbacks, and why it is we're still using them.