Jungle vines are spreading faster in South America's Amazon rainforest than before, choking trees and potentially slowing the forests' ability to soak up damaging greenhouse gases, scientists say. The spread of woody vines -- like the ones Tarzan swings from in the movies-- is the first change in plant composition that scientists have recorded in the deepest virgin jungle, and suggests mankind is having more impact on delicate ecosystems than previously shown. A team of researchers from Bolivia, Ecuador, Peru and the United States, led by Oliver Phillips of Leeds University in Britain, counted and measured the vines, called lianas,...