Climate change's rising seas may threaten tens of millions more people than scientists and government planners originally thought because of mistaken research assumptions on how high coastal waters already are, a new study said. Each way measures their own areas properly, he said. But where sea meets land, there's a lot of factors that often don't get accounted for when satellites and land-based models are used. Studies that calculate sea level rise impact usually "do not lo... [4453 chars]