greenhouse gas emissions in the 2020

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RCP 2.5 assumes a peak in greenhouse gas emissions in the 2020s, with a reduction thereafter. What does 2.5 represent?

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An additional radiative forcing of 2.5 watts per square metre by 2100

2.5 degrees of warming by 2100

the release of 2.5 million additional Gt of carbon to the atmosphere by 2100

A reduction in atmospheric CO2 concentration of 2.5 ppm by 2100

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