The Mopani worm is the protein-rich caterpillar of the Emperor moth, which can supplement any diet. But as the lack of rain continues to cause havoc with the harvests in this southern African nation, it is now also affecting the supply of Mopani worms. (...) In 2005, the Intergovernmental Panel on Climate Change predicted that climate change would result in increasing aridity in southern Africa, one of the most populous parts of the continent. It also predicted that food production in countries like Zimbabwe would halve by 2020.
Despite their scarcity, Mopani worms remain big business in other parts of southern African. In Botswana it is a multi-million dollar industry, and South Africa harvests up to 1.6 million kilogrammes of Mopani worms annually. (...)

The article:
http://ipsnews.net/news.asp?idnews=107167

Basic information:
http://en.wikipedia.org/wiki/Gonimbrasia_belina