Watch: Singapore researchers are trying to give banana skins and coconut husks a new lease of life in water purification kits that can be used in disaster situations. They could one day also be used in the manufacture of batteries.
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Our urban infrastructure is responsible for almost 40 per cent of global carbon emissions. Climate solutions need to include the biggest energy guzzlers, clean energy and retrofitting old buildings.
Worldwide, 100 million families are stuck in a cycle of poverty and disease because of the lack of access to clean water. What would it take to slake humanity's thirst for water in a sustainable way?