Geoengineering for global warming: Increasing aerosols in atmosphere would make sky whiter

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ScienceDaily: Earth Science News

Catching solar particles infiltrating Earth’s atmosphere

Posted: 31 May 2012 05:09 PM PDT

On May 17, 2012, an M-class flare exploded from the sun. They caused a shower of particles to cascade down toward Earth’s surface. The shower created what’s called a ground level enhancement (GLE).

Chemical substitution: On early Earth, iron may have performed magnesium’s RNA folding job

Posted: 31 May 2012 05:09 PM PDT

Researchers have used experiments and numerical calculations to show that iron, in the absence of oxygen, can substitute for magnesium in RNA binding, folding and catalysis. The findings suggest that three billion years ago, on the early Earth, iron did the chemical work now done by magnesium.

Geoengineering for global warming: Increasing aerosols in atmosphere would make sky whiter

Posted: 31 May 2012 08:26 AM PDT

One idea for fighting global warming is to increase the amount of aerosols in the atmosphere, scattering incoming solar energy away from Earth’s surface. But scientists theorize that this solar geoengineering could have a side effect of whitening the sky during the day. New research indicates that blocking 2 percent of the sun’s light would make the sky three-to-five times brighter, as well as whiter.

‘Like a jet through solid rock:’ Volcanic arc fed by rapid fluid pulses

Posted: 31 May 2012 07:19 AM PDT

The depths of Earth are anything but peaceful: large quantities of liquids carve their way through the rock as fluids, causing magma to form. Scientists have now shown that the fluids flow a lot faster through solid rock than previously assumed.

Potentially civilization-ending super-eruptions may have surprisingly short fuses

Posted: 30 May 2012 02:20 PM PDT

Super-eruptions are potentially civilization-ending events and new research suggests that they may have surprisingly short fuses.

Landslides linked to plate tectonics create the steepest mountain terrain

Posted: 30 May 2012 12:20 PM PDT

New research shows some of the steepest mountain slopes in the world got that way because of the interplay between terrain uplift associated with plate tectonics and powerful streams cutting into hillsides, leading to large landslides.

Why Earth is not an ice ball: Possible explanation for faint young sun paradox

Posted: 30 May 2012 12:20 PM PDT

More than 2 billion years ago, a much fainter sun should have left the Earth as an orbiting ice ball. Why we avoided the deep freeze is a question that has puzzled scientists, but one astronomer might have an answer.

Arctic bacteria help in the search to find life on Jupiter’s moon Europa

Posted: 30 May 2012 07:04 AM PDT

In a fjord in Canada, scientists have found a landscape similar to one of Jupiter’s icy moons: Europa. It consists of a frozen and sulfurous environment, where sulfur associated with Arctic bacteria offer clues for the upcoming missions in the search for traces of life on Europa.
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