Carbon dioxide (CO2) reached new highs at 400.0 ± 0.1 ppm in the atmosphere at the end of 2016.
Global sea-ice extent dropped more than 4 million km2 below average – an unprecedented anomaly – in November.
Global sea levels rose strongly during the 2015/2016 El Niño, with the early 2016 values making new records.
Drought conditions predominated across much of the globe, aggravated by the El Niño phenomenon.
The report concluded that mitigating climate change and its impacts will require building on the momentum achieved by the Paris Agreement on Climate Change, which entered into force on 4 November 2016. Stronger efforts are needed to build resilience and limit climate-related hazards and natural disasters.