With most of the world's population now living in urban areas, cities will need to adapt and prepare for climate change. Some are already rising to the challenge.
Over 30 mayors from across the globe have pledged to deliver clean air for the 140 million people living in their cities. Delivering clean air on such a scale will take both ambitious targets and concrete action.
Illegal refrigerant imports are flooding the European market, contributing emissions equivalent to four coal-fired power plants in 2018. These hydrofluorocarbons, also known as HFCs, primarily come from China.
Over 90 mayors of the world's biggest cities have signed a Global Green New Deal in Copenhagen this week. Freetown's mayor Yvonne Aki-Sawyerr talks environmental justice, tackling pollution and what gives her hope.
Climate group Extinction Rebellion has condemned a ban on protests in London, but says its campaign will go on. The prohibition, after a week of action, came after activists targeted the UK's financial district.
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