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Mr Hodder adds that there is a high population density in Mogadishu - people driven into the city by drought and conflict.

Yet the the tariff turmoil comes just as Spanish producers and exporters have recovered from a drought that slashed harvests in the south of the country, and sent prices temporarily soaring.

But experts say climate change has made erratic weather - such as unseasonal rains, flash floods and droughts linked to extreme heat - a more regular phenomenon, directly affecting millions of people.

He said by working together in this way, the agencies will have greater flexibility to meet future challenges together, whether related to drought, infrastructure investment or efforts to address chronic shortages along the Colorado River.

It was especially prevalent during the 1976-77 drought, when residents had to drain their pools and kids began performing elaborate airborne tricks.