Guardian: We have far more oil, coal and gas than we can safely burn. For all the millions of words written about climate change, the challenge really comes down to this: fuel is enormously useful, massively valuable and hugely important geopolitically, but tackling climate change means leaving most of it in the ground by choice. Although we often hear more about green technology, consumption levels or population growth, leaving fuel in the ground is what it all boils down to. After all, the climate doesn't...