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WASHINGTON — Wind turbines, solar panels and electric vehicles are spreading far more quickly around the world than many experts had predicted. But this rapid growth in clean energy isn’t yet fast enough to slash humanity’s greenhouse gas emissions and get global warming under control.

That’s the conclusion of the International Energy Agency, which on Tuesday published its annual World Energy Outlook, an 810-page report that forecasts global energy trends to 2040. Since last year, the agency has significantly increased its future projections for offshore wind farms, solar installations and battery-powered cars, both because these technologies keep getting cheaper and because countries like India keep ramping up their clean-energy targets.

But the report also issues a stark warning on climate change, estimating that the energy policies countries currently have on their books could cause global greenhouse gas emissions to continue rising for the next 20 years. One reason: The world’s appetite for energy keeps surging, and the rise of renewables so far hasn’t been fast enough to satisfy all that extra demand. The result: fossil fuels use, particularly natural gas, keeps growing to supply the rest.

“Without new policies in place, the world will miss its climate goals by a very large margin,” said Fatih Birol, the agency’s executive director.