Earth
- Paleontology
Oceans may have poisoned early animals
High sulfur and low oxygen produced a deadly brew nearly 500 million years ago that apparently stalled a burst of evolutionary change.
- Life
Flower sharing may be unsafe for bees
Wild pollinators are catching domesticated honeybee viruses, possibly by touching the same pollen.
- Earth
Bugged forests bad for climate
Trees savaged by pine beetles are slow to recover their ecological function as greenhouse gas sponges.
- Earth
Climate action could save polar bears
Cutting fossil fuel emissions soon would retain enough sea ice habitat for threatened species, scientists say.
- Earth
Gassy volcanoes tied to mass extinction
Chemicals from a massive Siberian eruption 250 million years ago may have polluted the atmosphere and killed off most life on the planet.
- Humans
Apartments share tobacco smoke
Children in nonsmoking families have higher levels of secondhand exposure if they live in multifamily dwellings.
- Earth
Clouds warm things up
Satellite data from the last decade put hard numbers on a key and little-understood climate player.
- Tech
Dirty money 2: Expect traces of BPA
BPA showed up on 21 of the 22 greenbacks surveyed in a new study. And the clean dollar? It appeared quite new, suggesting that dollars only become contaminated as they circulate.
- Earth
Icequake swarms portend some avalanches
By keeping an ear to the ice, scientists can predict impending glacial crack-ups two weeks in advance.
- Tech
Heavier crudes, heavier footprints
BLOG: Refining heavy oils and tar sands could greatly exaggerate the greenhouse gases associated with fossil-fuel use, a new study finds.
- Humans
Food security wanes as world warms
Global warming may have begun outpacing the ability of farmers to adapt, new studies report.
- Physics
Dissolving a puzzle
A mathematical analysis shows what it takes to remove rock fast enough to create a cavern.
