Main climate threat from carbon dioxide sources yet to be built

New energy-efficient or carbon-free technologies can help cut carbon dioxide emissions, but what about the power plants, cars, trucks, and other fossil-fuel-burning devices already in operation? Unless forced into early retirement, they will emit carbon dioxide into the atmosphere for decades to come. Scientists have calculated the amount of carbon dioxide expected to be released from existing energy infrastructure worldwide, and then used a global climate model to project its effect on the Earth's atmosphere and climate.

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