Settled junk science: Although natural reasons for variations in East African rains are "poorly understood", CO2 may account for 99% of the risk of long rains failure

Humanitarian disaster blamed on climate change - environment - 01 March 2013 - New Scientist

[March 1, 2013] Natural mechanisms probably also played a role in the rain failure. Sea surface temperatures over the Indian Ocean vary, and this seems to affect rain patterns over sub-Saharan Africa. The problem is that the natural mechanism – and the extent of its control over the rains – is poorly understood.

The team calculate that climate change is responsible for between 24 per cent and 99 per cent of the risk of long rains failure.