Crescimento Populacional

"Humanity's footprint has more than tripled between 1961 and 2003," it said. Consumption has outpaced a surge in the world's population, to 6.5 billion from 3 billion in 1960. U.N. projections show a surge to 9 billion people around 2050. It said that the footprint from use of fossil fuels, whose heat-trapping emissions are widely blamed for pushing up world temperatures, was the fastest-growing cause of strain. Leape said China, home to a fifth of the world's population and whose economy is booming, was making the right move in pledging to reduce its energy consumption by 20 percent over the next five years.

"Much will depend on the decisions made by China, India and other rapidly developing countries," he added.

The WWF report also said that an index tracking 1,300 vetebrate species -- birds, fish, amphibians, reptiles and mammals -- showed that populations had fallen for most by about 30 percent because of factors including a loss of habitats to farms. Among species most under pressure included the swordfish and the South African Cape vulture. Those bucking the trend included rising populations of the Javan rhinoceros and the northern hairy-nosed wombat in Australia.

Ben Blanchard, Reuters - Yahoo News