First global study shows 22 percent of plants threatened
Agriculture and other human activity pose biggest dangers
By Kate Kelland, Health and Science Correspondent LONDON, Sept 29 (Reuters) - One in five of the world's 380,000 plant species is threatened with extinction and human activity is doing most of the damage, according to a global study published on Wednesday. Scientists from Britain's Botanic Gardens at Kew, London's Natural History Museum and the International Union for the Conservation of Nature (IUCN), found that more than 22 percent of species were endang