For the first time, the report includes a chapter devoted to the social aspects of climate mitigation

Much of South Sudan is under water from flooding induced by climate change and deforestation. Crops and livestock are lost, hunger and malaria are spreading. With so many worries, coronavirus vaccines are a tough sell.

Rich governments have pledged $100bn to help poorer countries reduce emissions. But there is no agreement on how to spend the funds.

Top medical journal warns that rising temperatures will worsen heat and respiratory illness and spread infectious disease.