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A local environmental group slams the plan for the just-approved 58-acre facility, which will eventually employ 2,800 people but faces months of hearings before breaking ground

By the end of the century, scientists say, megafires-conflagrations that chew up at least 100,000 acres of land-will become the norm. Which makes them of critical interest to researchers. These infernos, once rare, are growing to sizes that U.S. Forest Service Chief Tom Tidwell describes as "unimaginable" two decades ago. Five alone have consumed more than five million acres in central Alaska since June. Washington, Oregon, California, Arizona, New Mexico and Colorado also experienced their worst wildfires in the past seven years.

Rising temperatures are increasing the number of "megafires" in the forests of the western U.S., experts say. Tackling and preventing such fires could require a significant shift in firefighting and forest conservation strategies. "These stresses are going to become more widespread," warned Craig Allen, a U.S. Geological Service forest ecologist. National Geographic News (free registration) (8/9) 

The proposed Pebble Mine in southwestern Alaska is a project of almost unfathomable scale. The Pebble Limited Partnership intends to excavate a thick layer of ore - nearly a mile deep in places - containing an estimated 81 billion pounds of copper, 5.6 billion pounds of molybdenum, and 107 million ounces of gold. The mine would cover 28 square miles and require the construction of the world's largest earthen dam - 700 feet high and several miles long - to hold back a 10-square-mile containment pond filled with up to 2.5 billion tons of sulfide-laden mine waste. All this would be built not only in an active seismic region, but also in one of the most unspoiled and breathtaking places on the planet - the headwaters of Bristol Bay, home to the world's most productive salmon fishery. Composed of tundra plain, mountain ranges, hundreds of rivers, and thousands of lakes, the greater Bristol Bay region encompasses five national parks and wildlife refuges, and one of the largest state parks in the U.S.