Fig. 1: Shifting benchmarks. | Nature Geoscience

Fig. 1: Shifting benchmarks.

From: Politically informed advice for climate action

Fig. 1

a, Maximum greenhouse gas emissions (expressed as CO2 equivalents) compatible with a 2 °C trajectory in 2020, 2025 and 2030, as given by the UNEP Emissions Gap Reports23,24. b, Benchmark values in the 2015 edition are about 20% higher than in the 2013 edition. This shift was a result of the introduction of a new scenario category — “limited action until 2020” — in the face of insufficient mitigation and slightly increasing global greenhouse gas emissions, resulting in widening emission gaps. The benchmark for 2020 (52 Gt) has been kept stable in the 2016 edition, whereas the 2017 edition does not contain a benchmark for 2020 anymore. Panel b courtesy of UN Environment Programme.