Sites where levee failures led to the catastrophic flooding after Hurricane Katrina would join a federal list of the nation's historic icons if an activist has her way.

They may be small in stature, but kids at a California elementary school have gotten more than 55,000 people to sign an online petition asking Crayola to "take back" and recycle used plastic markers.

(Reuters) - Apple Inc plans to power its main, North Carolina data center entirely with renewable energy sources by the end of this year, taking steps to address longstanding environmental concerns about the rapid expansion of high-consuming computer server farms.

The U.S. government is seeking to close caves in national forests in the Northern Rockies to stem the spread of white-nose bat syndrome, a disease that has killed an estimated 5.5 million bats in 19 states and is spreading westward, officials said on Wednesday.

GENEVA (Reuters) - A World Trade Organization appellate panel on Wednesday said U.S. "dolphin safe" tuna labeling rules unfairly discriminate against Mexico, raising the possibility of sanctions on U.S. goods if the rules are not modified or dropped.

When it comes to leatherback turtles, the world's largest species of sea turtle, there's a conundrum: The species itself is critically endangered, but at least one leatherback population is stable — on the rise, even — while others plummet.

For the first time in 20 years, U.S. health officials have lowered the threshold for lead poisoning in young children.

By now, it’s hardly news when a city bans plastic bags at checkout counters -- but an entire state? That’s happened in Hawaii, where Honolulu County has joined the state’s three other counties to give Hawaii a first-in-the-nation title.

The idled San Onofre nuclear power plant is facing new scrutiny from Congress as the utility that operates it moves closer to proposing a fix to get the twin reactors back in service.

Without fanfare, the nation's nuclear power regulators have overhauled community emergency planning for the first time in more than three decades.

A gas leak on a North Sea oil platform has been stopped after more than seven weeks, its operators said Wednesday. Heavy mud was pumped into the well in a bid to "kill" the leak on Total's Elgin platform, which is around 150 miles from Aberdeen, Scotland.

The island nation of Kiribati is one of the countries most threatened by rising sea levels. However, many of the floods it has seen may be due to a mix of natural variability and human activities, complicating the picture of how rising sea levels are endangering Kiribati and other island nations.

Meteorologists say unseasonable weather pushed last month to the fifth warmest April on record worldwide.

LONDON (Reuters) - Malaria-carrying mosquitoes in Africa and India are becoming resistant to insecticides, putting millions of lives at greater risk and threatening eradication efforts, health experts said on Tuesday.

A record number of fish populations have been rebuilt in U.S waters, even as problems continue to threaten the future of the high-profile New England fishing industry, according to a federal report released Monday.

On an arid plain where sudden gusts of wind can rip roofs off buildings and knock over tractor trailers, Mexico is building a new engine for its energy future.