Guardian: Abu Dhabi has taken a 20% stake in the London Array – the £3bn project to build the world’s largest offshore wind farm in the Thames estuary. Masdar, part of Abu Dhabi’s multibillion-pound drive to develop green energy technologies, is buying part of the 50% stake in the project held by the German-based utility E.ON. The link-up, which came as the government committed the UK to slashing greenhouse gas emissions by 80% by 2050, was welcomed by the prime minister, Gordon …