More than 100 people have been killed in monsoon floods in South Asia, as torrential rain caused chaos in several countries.
Hundreds of thousands of people have been displaced, with many rescued from rising waters and housed in shelters.
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Polio could be eradicated in Pakistan within months, health officials say, as a mass vaccination drive is launched.
A World Health Organisation spokesman told the BBC only a handful of cases have been reported this year in Pakistan and neighbouring Afghanistan.
The two countries are the last places where polio remains endemic.
James Gallagher, health editor
More than two billion people live in parts of the world where the Zika virus can spread, detailed maps published in the journal eLife show.
The Zika virus, which is spread by Aedes aegypti mosquitoes, triggered a global health emergency this year.
A train carrying half a million litres of water has been dispatched to the worst-affected areas of India's drought-hit western Maharashtra state.
The "water train" is pulling 10 tankers filled with water to Latur district.
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A mobile insurance scheme to help small-scale farmers in Kenya insure their agricultural produce against drought and other natural disasters is spreading to other parts of Africa, as Neil Ford explains.
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