[The Conversation Africa] Six in 10 people will be living in cities by 2030. This is concerning. Cities are responsible for over 70% of global greenhouse gas emissions. Yet cities can also do a lot to mitigate climate change and help people adapt to its impacts. Cities can use renewable energy sources, promote greener transport, and get industries to cut pollution and adopt cleaner production techniques. Also, they can form or use existing networks and partnerships to strengthen these efforts.