Earth

Agriculture

Fishy Alpha Males

As a way to protect wild fish stocks, raising genetically engineered fish may be futile should some of these modified fish escape into the environment.

Earth

Lowering the Boom? Impact crater may predate extinction of the dinosaurs

Analyses of sediments from the Yucatán in Mexico suggest that an extraterrestrial impact there more than 65 million years ago actually happened about 300,000 years before mass extinctions of dinosaurs occurred.

Earth

Killer Waves

Scientists are using sophisticated computer models, field studies of coastal geology, and data from tidal gauges to assess the tsunami risk for coastal residents.

Earth

Nanosponges: Plastic particles pick up pollutants

Nanometer-scale polymer particles can extract pollutants from contaminated soil.

Earth

Catching Waves: Ocean-surface changes may mark tsunamis

A new theoretical model that describes a tsunami's interaction with winds may explain enigmatic observations associated with the waves and could lead to a technique for spotting them long before they hit shore.

Earth

Desert Life

What is a desert? How many deserts are in North America? This extensive Web site offers information about the desert environment and the unique characteristics that define the beautiful desert landscapes of the U.S. Southwest. It includes images, stories, movie and audio clips, and virtual-reality tours on many desert-related topics, from plants and animals to […]

Earth

Ancient whalers altered arctic lakes

Analyses of sediment and water samples taken from an arctic lake indicate that an ancient whaling community left a mark on the lake’s ecosystem that persists today, even though the settlement was abandoned more than 400 years ago.

Earth

Ice-dammed lakes had cooling effect

New computer simulations suggest that massive lakes in northern Russia—formed when an ice sheet blocked the northward flow of rivers about 90,000 years ago—significantly cooled the region's climate in summer months.

Earth

Danger on Deck?

The Environmental Protection Agency no longer allows residential installation of pressure-treated lumber and recommends the application of sealant to prevent leaching of carcinogens out of existing lumber structures.

Earth

Warming climate may slam many species

Expected increases in global temperature could eradicate from a sixth to a half of the plant and animal species across large areas of the globe, a new analysis suggests.

Earth

Farmed salmon bring PCBs to the table

High concentrations of chlorinated organic contaminants in farm-raised Atlantic salmon may warrant limiting consumption of the otherwise-healthful fish to no more than once per month.

Earth

Air held oxygen early on

Chemical analyses of South African sediments suggest that oxygen was present in small quantities about 2.32 billion years ago, which is at least 100 million years earlier than previously thought.