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The US built nearly 2,000 km of Mississippi River levees to control floods; the barriers cut sediment off from Louisiana wetlands, helping erase about 4,900 sq km of coastal land New York investigator accused of tracking ex-girlfriend 3,000 times using Flock cameras; suspended after 4,000 searches New Jersey built a massive seawall to protect a highway and beach houses from erosion; USGS says the wall concentrated wave energy until the beach it was meant to defend disappeared completely The US had just two 500-foot smokestacks in 1970 and more than 180 by 1985 to dilute local pollution; the taller stacks sent emissions farther downwind and helped spread acid rain Britain brought back wild bison after 6,000 years; their grazing could reshape forests and create new habitats for other wildlife | World News