A tractor widens part of the Assurini road in the heart of the Amazon jungle in the village of Ressaca in the state of Para, northern Brazil, August 18, 2005. Environmentalists estimate as much as 20 percent of the jungle has already been cut down by ranchers, loggers, farmers and developers. The Amazon is home to up to 30 percent of the planet's animal and plant species. REUTERS/Paulo Whitaker PW/KS