Sewage and agricultural pollution having 'alarming' impact on UK's underwater forests 7 hours ago Steffan Messenger Wales environment correspondent Lewis M. Jefferies Seagrass meadows are usually teeming with life, like this shore crab Sewage and agricultural pollution in rivers is having an "alarming" knock-on impact on marine life in underwater forests along the British coastline, according to new research. Scientists found seagrass meadows affected by excessive nutrients in the water - caused by sewage, fertilisers, manure and industry wastewater - had far fewer and less variety of small invertebrates like crabs, shrimps and snails. "People don't want to swim in seas polluted by sewage," said Dr Benjamin Jones from Project Seagrass, which carried out the research with Swansea University. "But this is one of the first studies of its kind to show that some of those nutrient inputs...…