It is often argued that dependence on carbon fuels should be reduced as soon as possible - both for fears of our 'running out' of them and of their impact on global warming. But the ideas of 'peak oil' and 'peak gas' are both myths. Indeed, there is little by way of 'renewable' sources of energy being able to secure more than 40% of total energy requirements in 2100. Thus oil, gas and coal will continue to dominate the world's energy supply for many decades. If need be, the only solution in the event of global warming would be by sequestering the carbon underground.