Figure : caq_emissions_reductions_v3

Benefit of Earlier Action to Reduce Emissions

Figure A5.23

U.S. Global Change Research Program USGCRP
Matthew Dzaugis

This figure appears in chapter A5 of the Impacts, Risks, and Adaptation in the United States: The Fourth National Climate Assessment, Volume II report.

This figure shows possible future pathways for global annual emissions of GHGs for which the global mean temperature would likely (66%) not exceed 3.6oF (2oC) above the preindustrial average. The black curves on the bottom show the fastest reduction in emissions, with rapid near-term mitigation and little to no negative emissions required in the future. The red curves on top show slower rates of mitigation, with slow near-term reductions in emissions and large negative emission requirements in the future. Here, the annual global GHG emissions are in units of gigatons of CO2 equivalent, a measurement that expresses the warming impact of all GHGs in terms of the equivalent amount of CO2. Source: adapted from Sanderson et al. 2016.bf91f878-c82a-409b-8d96-e21320366a69

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This figure was created on June 15, 2017.

This figure was submitted on December 03, 2018.

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