San Francisco — A group of companies and nonprofit agencies that includes energy giants Royal Dutch Shell and BHP Billiton said global greenhouse gas emissions could be cut in half by 2040 without impeding economic development, in part by converting grids to use mostly renewable power. The declining costs of wind, solar and batteries will make it possible within 15 years to build power networks that get as much as 90% of their power from renewable sources while providing electricity at a cost that is competitive with fossil-fuels, according to a report released Tuesday by the Energy Transitions Commission, a group of energy companies, investors and nonprofit organisations, including the Rocky Mountain Institute. The study’s details will be outlined on Tuesday at the Bloomberg New Energy Finance Future of Energy Summit in New York and presents a road map towards meeting the Paris climate agreement aimed at keeping global warming well below 2°C. It comes as US President Donald Trump i...

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