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By Richard Gray, Science Correspondent. 6:45AM BST 26 Jun 2011

Warming ocean waters are causing the largest movement of marine species seen on Earth in more than two million years, according to scientists.

In the Arctic, melting sea ice during recent summers has allowed a passage to open up from the Pacific ocean into the North Atlantic, allowing plankton, fish and even whales to into the Atlantic Ocean from the Pacific. Read the full story