TAMPA, Fla., May 20 (Reuters) - A record dolphin die-off in the northern Gulf of Mexico was caused by the largest oil spill in U.S. history, researchers said on Wednesday, citing a new study that found many of the dolphins died with rare lesions linked to petroleum exposure.
NEW LONDON, Connecticut, May 20 (Reuters) - Rising seas and thawing permafrost caused by warmer global temperatures threaten U.S. military bases and will change the way the U.S. armed services defend the country, President Barack Obama said on Wednesday.
ABUJA, May 20 (Reuters) - Outgoing Nigerian President Goodluck Jonathan has approved the 4.5 trillion naira ($22.6 billion) budget for 2015, which was passed by parliament in late April, the president's spokesman said on Wednesday.
LONDON, May 20 (Reuters) - Oil-market watchers are struggling to reconcile the large estimated oversupply in the market with the much smaller buildup of reported inventories and narrowing contango in futures prices.
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