The rich are primarily to blame for the global climate crisis, a study by the University of Leeds of 86 countries claims. The wealthiest tenth of people consume about 20 times more energy overall than the bottom ten, wherever they live. The gulf is greatest in transport, where the top tenth gobble 187 times more fuel than the poorest tenth, the research says. That’s because people on the lowest incomes can rarely afford to drive. The researchers found that the richer people became, the more energy they typically use. And it was replicated across all countries. And they warn that, unless there's a significant policy change, household energy consumption could double from 2011 levels by 2050. That's even if energy efficiency improves.