South Africa is in the grip of the worst ever El Niño event in recorded history. But experts say the problem of dwindling water supply pales in comparison to the problem of water quality. Blue-green algae – an organism that releases a toxin similar to snake venom – has infiltrated two thirds of South Africa’s drinking-water sources. Removing it is an extensive and expensive process, raising fears that South Africa could soon be facing a serious drinking water crisis. View the full article here: