KAMPALA (Reuters) - Changing weather patterns in Uganda may lead to the extinction of the east African country's key export, coffee, in coming decades, a report by British charity Oxfam said on Thursday.

"The outlook is bleak. If the average global temperatures rise by two degrees or more, then most of Uganda is likely to cease to be suitable for coffee..this may happen in 40 years or perhaps as little as 30," the report said.