Since the 1980s, as global temperatures warmed again, Sahel rainfall increased dramatically again.

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This may possibly be because of decreased rainfall, not increased temperatures, as Gore argues.

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During the first half of the twentieth century, as global temperatures rose in the aftermath of the Little Ice Age, rainfall in the Sahel increased dramatically.

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Though rain is indeed falling, it is unclear to what extent the cloud-seeding operations have increased the rainfall and whether it will be enough to pull Venezuela out of its electricity crisis.

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Above average rainfall is thought to have increased the amount of debris and animal faeces washed off the land.

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Soil degradation could be worsened by increased erosion caused by higher rainfall, while elsewhere more land could become desert.

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Statistics show that the rainfall intensity in northern provinces in China has increased in recent years, especially after 2008, Wu said.

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While hundreds of studies around the world have linked climate change to phenomena including the increased frequency and intensity of hurricanes and other storms, changing rainfall patterns, drought, coastal flooding, changing disease patterns and the migration of human populations.

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