Britain has squandered its windfall of natural resources from North Sea oil and gas. Instead of prudently investing the 'unearned income' from nature, to build a safe, clean and green energy supply for the nation, we face unnecessary shortages. But there is still a chance to put the proceeds from liquidating our fossil fuel assets to better and more appropriate use. Instead of oil companies profiteering from climate change and oil depletion, a windfall tax could establish an Oil Legacy Fund to pay for Britain's urgent transition to a sustainable, decentralised energy system