Could the world emit less carbon dioxide?

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Cutting global emissions of carbon dioxide and other greenhouse gases by 50% by 2050 would mean replacing fossil fuels with low-carbon alternatives on a large scale. Building the necessary infrastructure will take time, but there are other ways we could cut emissions in the near term. We could capture carbon dioxide and put it into the ground instead of the atmosphere. And we could use less energy, either by changing our behaviour or through greater energy efficiency.