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After years of unrelenting drought, federal forecasters reported there are better-than-even odds that the nation's largest reservoir will decline into shortage conditions by 2020, forcing Arizona, Nevada and Mexico to reduce their Colorado River water use.

A new study by scientists from NASA and the University of California, Irvine, has found that over 75 percent of the water loss in the drought-stricken Colorado River Basin since late 2004 came from underground resources. The extent of groundwater loss may pose a greater threat to the water supply of the western United States than previously thought.

Sales of organic produce have been steadily rising, and farmers worldwide have stepped up to provide a year-round supply of certified organic fruits and vegetables, experts say. Nearly all items in the produce section are available in organic, with prices fluctuating based on supply, says Claris Ritter of Alfalfa's Market in Colorado. "Price is really a function of supply, and we're still having greater demand than supply," Ritter said. "We'll have to see, if we ever do catch up to the demand, what happens with the price

This week, scientists from The Nature Conservancy and The Dow Chemical Company, with research support from Colorado State University and Duke University, published Finding solutions to water scarcity: Incorporating ecosystem service values into business planning at The Dow Chemical Company's Freeport, Texas facility, which addresses challenges businesses face to accurately estimate the value of water resources and address future scarcity threats. 

Trader Joe's announced last week that it will transition its entire egg supply to cage-free sources. First up are Western states: Eggs sold in California, Oregon, Washington, Arizona, New Mexico and Colorado will be 100 percent cage-free by 2020. All eggs across Trader Joe's stores will be sourced from cage-free suppliers by 2025. But the company might meet its goals sooner.

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) 

In the Arctic Ocean, some ice stays frozen year-round, lasting for many years before melting. But this winter, the region hit a record low for ice older than five years.