Congress decision, under pressure from the gun lobby, to allow loaded, concealed weapons in National Parks creates problems for rangers trying to keep people safe.

A power plant under construction on a Finnish island was supposed to be the showpiece of a nuclear renaissance. But it is way behind schedule and over budget.

"Researchers find climate change is already having a 'sometimes hidden and often unequal' impact on minorities and poor in the United States."

Energy Secretary Chu and CA Gov. Schwarzenegger today will dedicate the National Ignition Facility, a mammoth laser device designed to explore fusion energy.

The flame-retardant chemicals known as PBDEs are virtually ubiquitous in U.S. waters. New research shows that when PBDEs are exposed to wastewater treatment, they can generate dioxins.

Touring the Everglades by airboat, Interior Secretary Salazar promised more federal funds to restore them.

"U.S. government and university scientists are partnering to form a new cooperative institute that will use satellite observations to detect, monitor and forecast climate change and its impact on the environment."

Agriculture Secretary Vilsack took personal control over logging and road projects on tens of millions of acres of National Forest in a temporary effort to resolve controversy over the "Roadless Rule."

Two key House leaders have introduced a bill that would drastically overhaul and tighten the nation's food safety system.

The earth's species may be facing a sixth major mass extinction that could take millions of years to recover from, Elizabeth Kolbert reports in The New Yorker.

"China is ready to strengthen its cooperation with the United States to combat climate change, Premier Wen Jiabao told US House Speaker Nancy Pelosi on Wednesday, state media reported."

The economic stimulus will bring another $2 billion in cleanup funds to the Hanford nuclear reservation in Washington state.

Scientists from the National Center for Atmospheric Research say melting Greenland ice sheets could raise sea levels more in the northeaster US and Maritime Canada because of a change in ocean currents.

American shad are struggling with little success to make a comeback in Virginia's James River. Historically abundant, this "founding fish" disappeared for years because its spawning was blocked by dams.

A draft bill from the House Natural Resources Committee would drastically reform the Interior Department's corruption-plagued system for collecting oil and gas royalties.