LiveScience: How long does it take to build a little more than 30,000 miles (50,000 kilometers) of new roads through the rain forest? A new study finds that, in the Brazilian Amazon, such development can happen in just three years. While roads cover only a tiny fraction of the total land surface of South America's largest nation, their effect on local ecosystems particularly rain forests may be huge. In an attempt to better understand road-building's effect on the Amazon, researchers from Imperial College...