In an attempt to go green, governments around the world are shunning coal and embracing a supposedly better alternative: natural gas. It's a decision that will shape the future of our planet - but it may not be the right one.

Meet Bob Ackley, former pawn-shop worker and gas company contractor, who has spent years crisscrossing America collecting data on the gas leaks that pepper the country's cities. And what he has found could mean that the fuel may be as damaging to our climate as coal.

How did a community college drop-out and climate change skeptic carve out an unconventional place amongst some of the world's foremost energy experts? Find out as science writer Phil McKenna unpicks the science behind our energy future.