ClimateWire: A combination of carbon dioxide emitted by human activities and nutrient runoff is transforming the chemistry of Washington state’s Puget Sound, according to a new study. Without intervention, the one-two punch could threaten the area’s shellfish industry, said lead author Richard Feely, a senior scientist at the National Oceanic and Atmospheric Administration’s Pacific Marine Environmental Laboratory in Seattle. Feely and his team sampled waters in Puget Sound in February and …