Global water shortage On the outskirts of Nairobi, a dirty blue tanker truck has pulled up at the side of a row of shacks and a man is selling jerrycans full of water to a small queue of women. Nearby, hanging from the trees and lying on the ground are scores of plastic bags. These are the “flying toilets” discarded by residents of the slums.
A few miles away, in the lawn-fronted compound of the United Nations Environment Programme, the world’s governments discuss climate change and how to help poor nations adapt to the problems, such as droughts and floods, that it will bring.
