For the past three years, botanist Vicki Funk of the Smithsonian Institution has been trying, unsuccessfully, to transfer select leaf specimens from Brazil to the U.S. National Herbarium for identification. Comparing closely related plants

Global warming has become such an overriding emergency that some climate experts are willing to consider schemes for partly shielding the planet from the sun's rays. But no such scheme is a magic bullet.

This describes the twelve easy steps to take to make your life a little greener.

1.Mow Down Emissions
2. Dead Bulb Depository
3. Blow Up the Car (Tires)
4. Wrap the Heater
5. Kid Power
6. Addicted to the Bottle
7. Save the Beach

“Wasteland” conjures up visions of dusty desolation where life is fleeting and harsh—if it exists at all. Oceans, too, have their inhospitable pockets. Scientists are discovering that climate change—and not just fertilizer from farm use—may be spurring the emergence of barren underwater landscapes in coastal waters. Expanding dead zones not only spell trouble for biodiversity, but they also threaten the commercial fisheries of many nations.

Just how harmful are baby bottles, eyeglasses and other bisphenol-A plastics? Patricia Hunt, who helped to bring the issue to light a decade ago, is still trying to sort it all out.

Tracking El Ni

Epidemiologists find molecular clues to air pollution's impact on youngsters.

As demand for freshwater soars, planetary supplies are becoming unpredictable. Existing technologies could avert a global water crisis, but they must be implemented soon.

The age-old practice of turning the soil before planting a new crop is a leading cause of farmland degradation. Many farmers are thus looking to make plowing a thing of the past.

The accelerating pace of climate warming in the earth