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Boosting renewable energy generation to meet global climate goals could save as much as $4.2 trillion a year by 2030, according to a new report asking lawmakers to strengthen clean energy policies.

Doubling the share of renewables in the world’s energy mix to 36 percent between now and 2030 would cost $290 billion a year and limit global warming to below two degrees Celsius, according to the Abu Dhabi-based International Renewable Energy Agency report published Thursday. Mitigating against the harmful effects of global warming accounts for much of the savings.

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