Renewable energy overtook coal as the world’s leading source of electricity in the first half of this year—a historic first, according to new data from the global energy think tank Ember. In the US, electricity demand grew faster than clean energy output, increasing reliance on fossil fuels, while in the EU, months of weak wind and hydropower performance led to a rise in coal and gas generation. In a separate report the IEA has halved its forecast for the growth of renewable