BRISTOL, England, May 25 -- The British Environment Agency issued the following news release: * * * A Roman oyster processing site has been uncovered during the building of a major coastal re-alignment scheme in Yorkshire. * * * The scheme will alter the location of existing flood defences so that new habitats can be created for wildlife. The new habitats will also increase levels of flood protection to local communities by absorbing wave energy. For the last three years the Environment Age  more