Rainfall patterns in southern Africa are becoming erratic as climate change takes its toll, threatening long-term production of staple and cash crops in the region.

The World Bank's Clean Technology Fund plans to invest $85 million in renewable energy and co-generation projects in South Africa, according to an advertisement in the Business Day newspaper on Friday.

The fund said it had $50 million available for wind and solar renewable energy projects and $35 million for co-generation, where waste energy and gases are used to produce power.

The $85 milli