Transient Climate Response to Cumulative CO2 Emissions

Definition

Transient Climate Response to Cumulative CO2 Emissions (TCRE) is a summary indicator of the impact on Earth's atmosphere of CO₂ emission.

Each 1000 GtCO₂ of cumulative CO₂ emissions is assessed to likely cause a 0.27°C to 0.63°C increase in global surface temperature with a best estimate of 0.45°C.

This relationship implies that reaching net zero anthropogenic CO₂ emissions is a requirement to stabilize human-induced global temperature increase at any level, but that limiting global temperature increase to a specific level would imply limiting cumulative CO₂ emissions to within a wikipedia:Carbon Budget.

This Report reaffirms with high confidence the AR5 finding that there is a near-linear relationship between cumulative anthropogenic CO2 emissions and the global warming they cause.