Facts4Paris: if every country matches the US pledge, in 2025 world emissions will be 6% higher than they were in 2010.

The world following the USA 2025 pledge

If countries were to choose targets comparable with those of the US (where comparabability is determined either according to a 'common but differentiated per-capita convergence' scheme or to an 'equal cumulative per-capita' approach) world emissions would be 6% higher in 2025 than they were in 2010. For a least-cost 2°C trajectory, world emissions need to be 15% below 2010 emissions, or 10% above 1990 levels by 2025. Check out www.mitigation-contributions.org to explore the outcomes of such calculations for a G20 country of your choice using different comparability approaches.

Source: See our new Nature Climate Change paper for methods and data.