Africa's megacities threatened by heat, floods and disease - urgent action is needed to start greening and adapt to climate change

Cities cover just 3% of the planet. But they emit 78% of all global greenhouse gas emissions, absorb 80% of final global energy (what consumers use) and consume 60% of clean drinking water. African megacities like Lagos, Nigeria (with 21 million residents) and Cairo, Egypt (with 10 million (...)