Water scarcity is an increasing problem on every continent, according to the United Nations.

Around half the world’s population experiences severe water scarcity for at least part of the year, according to a report by the Intergovernmental Panel on Climate Change.

Global warming and population growth is expected to make the situation worse, so what is it like to run a home or a business amid water shortages?

Ruth Alexander hears from households and businesses in Karachi, Pakistan and Bogata, Colombia, and finds out lessons from Cape Town, South Africa which was said to be approaching ‘Day Zero’ when the taps would run dry in 2018. Ruth explores whether desalination – harvesting drinking water from the sea - could ever offer a sustainable solution.

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Produced by Rumella Dasgupta and Beatrice Pickup.

(Image: people queuing for water in Cape Town, South Africa in 2018. Credit: Bloomberg/Getty Images/BBC)