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There are no sewers in Haiti. 26% of Haitians have access to a toilet, so a lot of the sewage ends up in the water supply. Currently, Haiti is battling the biggest cholera epidemic in recent history and thousands are dying. We travel there to meet a team of women who are trying to solve this massive problem. They have set up an NGO called Soil which delivers dry, compost toilets to peoples’ homes. Alternatives to water guzzling flushing toilets - which need infrastructure such as sewers - are drastically needed in many parts of the world. And there’s a bonus to this scheme too.

Also on the programme, a radical suggestion for airports: build circular runways. Are the current straight ones really the best way to take off and land?

Presenter: Sahar Zand
Reporters: Gemma Newby & Dougal Shaw
Producer: Charlotte Pritchard

Image: The women of Haiti who work for the NGO Soil / Credit: Â鶹Éç