Abstract
According to the Intergovernmental Panel on Climate Change (IPCC), the estimated remaining carbon budget from 2020 onwards to limit the global average temperature increase to 1·5°C above pre-industrial levels with a probability of 67% is about 400 Gt carbon dioxide or 1150 Gt carbon dioxide for limiting this global heating to 2°C.1 The IPCC estimates depend on various factors, including the rate at which other greenhouse gases, including methane, decline. If carbon dioxide emissions remain at a constant level, the carbon budget would be used up in about 7 years and 25 years, respectively.
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