In 'Revisiting Copenhagen climate mitigation targets' Shuping Li, Jing Meng et al look at how countries have succeeded/failed to meet their COP15 mitigation targets go.nature.com/3xQVEou

For more, see the News & Views from Nada Maamoun go.nature.com/3UwDT6V - 'COP15 laid the foundation for subsequent agreements, notably the Paris Agreement. The challenges encountered in achieving the mitigation targets set by COP15 illuminate the various obstacles faced'