Earth

Earth

Asteroid impact could have stirred the ocean

Model offers one explanation for sudden change in deep-ocean chemistry almost 2 billion years ago.

Climate

Guarded optimism on Copenhagen climate talks

Negotiators representing 181 nations completed their final prep work in Barcelona, Spain, last Friday, on a new climate treaty — one that they hope to build a month from now at a major conference in Copenhagen, Denmark. But at least one scientist worries that what comes out of the Copenhagen deliberations may not have sufficient coordination and strength to meet the challenges that Earth’s climate has begun throwing at us.

Health & Medicine

Vinegar: Label lead-tainting data

Under California’s Proposition 65 law, products containing chemicals that may cause cancer, birth defects or reproductive toxicity must carry a warning label at their point of sale. Among such products: pricy balsamic and red-wine vinegars that contain lead. At least some California groceries apparently have taken a conservative approach and post labels suggesting all such vinegars are dangerously tainted. Although they aren't.

Paleontology

Pollination in the pre-flower-power era

Scorpionflies with long-reaching mouthparts may have helped plants procreate long before blossoms evolved.

Earth

Nanoparticles’ indirect threat to DNA

Tiny metal nanoparticles can damage DNA, essentially by triggering toxic gossip.

Earth

Small earthquakes may not predict larger ones

Quakes far from tectonic plate boundaries may simply be aftershocks of ancient temblors.

Climate

Kyoto climate treaty’s greenhouse ‘success’

There are 33 days until the opening of formal negotiations in Copenhagen on the next global climate-protection treaty. The hoped-for accord would take up where the current treaty leaves off. But to get some perspective on just where that is, a new United Nations report describes for negotiators and the public just how much the Kyoto Protocol has achieved. And real strides have been made in slowing the growth of greenhouse-gas emissions, thanks to many European nations (albeit with little help from North American ones or Japan).

Climate

Mount Kilimanjaro could soon be bald

The world-renowned ice caps could disappear by 2022, new research suggests.

Chemistry

Aerosols cloud the climate picture

A NASA model incorporates how atmospheric aerosols and greenhouse gases interact, yielding better estimates of the gases' warming and cooling effects.

Earth

Unicorn fly of the Cretaceous

An ancient fly discovered trapped in amber sports a horn atop its head and topped with three eyes.

Earth

World’s longest cave formation still growing

Minerals still accumulate in New Mexico’s Snowy River.

Chemistry

How leaves could monitor pollution

Trees near high-traffic areas accumulate tiny particles.