Lake Chad - a source of water to millions of people in West Africa - has shrunk by nine-tenths due to climate change, population growth and irrigation. But can a scheme dating back to the 1980s ...

Along with much of East Africa, the Lake Turkana region has now had four failed rainy seasons, killing hundreds of thousands of animals and pushing millions of people to the brink of starvation.

No one's sure how the South American water hyacinth invaded Africa's Lake Victoria but there's little doubt as to the damages it has caused. In 1989, the weed was spotted in the lake and seven ...