Explaining the need to limit cumulative emissions of carbon dioxide.
Estimated cumulative emissions from fossil fuel use, cement production and land-use change since industrialization began are
546,679,332,919
tonnes of carbon.
To keep the most likely global warming caused by these sources of carbon dioxide to about 2°C, we need to keep the total emissions over time below about1,000,000,000,000 tonnes of carbon.
Based on the emission trends over the past 20 years, we predict the trillionth tonne will be emitted on
Mon, 09 May 2044 16:54:04 GMT
We would not release the trillionth tonne if emissions were to start falling now at
2.3159127852
% per year.
To keep a three in four chance of global warming remaining below 2°C, we need to keep the total carbon dioxide emissions over time below about750,000,000,000 tonnes of carbon.
Based on the emission trends over the past 20 years, we predict the 750-billionth tonne will be emitted on
Thu, 04 May 2028 12:25:09 GMT
We would not release the 750-billionth tonne if emissions start falling now at
4.9067968073
% per year.
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