Wealthy countries including the U.S. and some of the world’s biggest banks backed a $20 billion funding plan to steer Indonesia, the world’s largest coal exporter, toward renewables as part of efforts to help emerging economies decarbonize. The funding, announced at a meeting of G-20 leaders, is aimed at one of the thorniest climate challenges. Developing countries like Indonesia, India and South Africa say they can’t afford to quickly transition to renewable energy. But if they stick with fossil fuels, carbon emissions will rise as their economies grow.

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