Scientists say the oxygen-starved "dead zone" along the Pacific Coast that is causing massive crab and fish die-offs is worse than initially thought.
Scientists say weather, not pollution, appears to be the culprit, and no relief is in sight. However, some say there is no immediate sign yet of long-term damage to the crab fishery.
Oregon State University scientists looking for weather changes that could reverse the situation aren't finding them, and they say levels of dissolved oxygen critical to marine life are the lowest since the first dead zone was identified in 2002. It has returned every year.
Greenland melt 'speeding up'
Data from a US space agency (Nasa) satellite show that the melting rate has accelerated since 2004.
If the ice cap were to completely disappear, global sea levels would rise by 6.5m (21 feet).
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