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Reducing Early Earth
Topic: Climate
09/11/05
Using primitive meteorites called chondrites as their models, earth and planetary scientists at Washington University in St. Louis have performed outgassing calculations and shown that the early Earth's atmosphere was a reducing one, chock full of methane, ammonia, hydrogen and water vapor.

Asteroid Skywriters
Topic: Climate
08/30/05
Scientists from the Australian Antarctic Division, the University of Western Ontario, the Aerospace Corporation, and Sandia and Los Alamos national laboratories found evidence that dust from an asteroid burning up as it descended through Earth's atmosphere formed a cloud of micron-sized particles.

The Dog Days of the Permian
Topic: Climate
08/27/05
Scientists at the National Center for Atmospheric Research (NCAR) have created a computer simulation showing Earth's climate in unprecedented detail at the time of the greatest mass extinction in the planet's history.

New Window Into Ancient Ozone Holes
Topic: Climate
08/13/05
British researchers have hit on a clever way to search for ancient ozone holes and their relationship to mass extinctions: measure the remains of ultraviolet-B absorbing pigments ancient plants left in their fossilized spores and pollen.

Volcanoes Ate Oxygen
Topic: Climate
08/12/05
A number of hypotheses have been used to explain how free oxygen first accumulated in Earth's atmosphere some 2.4 billion years ago, but a full understanding has proven elusive. Now a new model offers plausible scenarios for how oxygen came to dominate the atmosphere.

Patient Planet: Then and Now
Topic: Climate
06/04/05
The dramatic and, in some cases, damaging environmental changes sweeping planet Earth are brought into sharp focus in a new atlas launched to mark World Environment Day (WED).

Organic-Rich Soup-in-the-Ocean
Topic: Climate
04/07/05
A new University of Colorado at Boulder study indicates Earth in its infancy probably had substantial quantities of hydrogen in its atmosphere, a surprising finding that may alter the way many scientists think about how life began on the planet.

Snowball Earth Scenario
Topic: Climate
03/06/05
Eons ago, giant clouds in space may have led to global extinctions, according to new research that outlines a rare scenario in which Earth iced over during snowball glaciations, after the solar system passed through dense space clouds.

Urban Smog: State of the World
Topic: Climate
10/14/04
Based on 18 months of Envisat observations, this high-resolution global atmospheric map of nitrogen dioxide pollution makes clear just how human activities impact air quality.

Breaking the Ice
Topic: Climate
09/23/04
When the vast Larsen B ice shelf broke off the Antarctic Peninsula, no one knew what would happen next to the nearby glacier flows. Would they accelerate and would sea level rise from global temperature changes?

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