"Modern architecture loves glass. Glass makes interiors brighter and adds sparkle to cityscapes. But glass also kills millions of birds every year when they collide with windows. Biologists say as more glass buildings go up, more birds are dying."

"SACRAMENTO, Calif. — Most of the salmon caught in California come from hatcheries in the Sacramento Valley, yet it turns out not much is known about these fish even though they are bred by hand."

"Lawmakers ratcheted up pressure on the Obama administration on Tuesday to speed approval for companies to export natural gas, arguing it would help relieve a glut dampening output of the fuel."

"The worst drought in half a century is slashing U.S. crop and livestock production, President Obama said on Tuesday as he called on Congress to pass a farm bill that will send disaster aid to more farmers and ranchers."

"As the worst drought in more than 50 years withers the Midwest corn crop, 25 senators urged the Environmental Protection Agency to cut the mandate that requires fuel blenders to add grain-based ethanol to gasoline."

"Investigators were looking at how a small, seemingly insignificant leak at one of the country's biggest oil refineries quickly unraveled into an intense fire that sent acrid black smoke into the sky and hundreds of people to hospitals with health complaints."

"An eight-year environmental pact to reduce air, water and chemical pollution along the U.S.-Mexico border will be signed by dignitaries from both countries, Environmental Protection Agency officials said Tuesday."