Reuters) - Climate change may pose a much more serious threat to the world's poor than existing research has suggested because of spikes in food prices as extreme weather becomes more common, Oxfam said on Wednesday.

More frequent extreme weather events will create shortages, destabilize markets and precipitate price spikes on top of projected structural price rises of about 100 percent for staples such as maize over the next 20 years, the charity said in a report.

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Weathered oil in the form of tar has washed up on some Louisiana beaches from Gulf waters churned by Hurricane Isaac, prompting restrictions of fishing in some waters and tests to determine whether the source is submerged oil from the 2010 Deepwater Horizon disaster.

Thousands struggling in the aftermath of Isaac "I'd say there's a smoking gun," said Garret Graves, Gov. Bobby Jindal's top adviser on coastal issues. He said tests were being done to verify the source of the oil.

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