A new study has found that powerful winds are removing massive amounts of snow from parts of Antarctica, potentially boosting estimates of how much the continent might contribute to sea level. Up to now, scientists had thought that most snow scoured from parts of the continent was simply redeposited elsewhere on the surface. However, the new study shows that in certain parts, called scour zones, some 90 percent—an estimated 80 billion tons per year—is instead being vaporized, and removed altogether. 

Read more ...

Un nuevo estudio del equipo Laboratorio de Ciencia de Marte y Curiosidades de la NASA, ha confirmado que Marte, hace miles de millones de años, fue capaz de almacenar agua en los lagos durante un período prolongado de tiempo.

Utilizando datos del Rover Curiosity (un astromóvil de la NASA, N del T), el equipo ha determinado que hace mucho tiempo, el agua propició el depósito de sedimentos en el cráter Gale, donde el Rover aterrizó hace más de tres años. El sedimento fue depositado como capas que formaron la base del Monte Sharp, la montaña encontrada en el centro del cráter.

Read more ...

Ever since human beings first began climbing the world's tallest mountains, they have struggled with a basic problem: altitude sickness, caused by lower air pressures which affect the ability of our bodies to take up oxygen. 

Or, as actor Jason Clarke says in his role as the climbing guide Rob Hall in the recently released movie, Everest, "Human beings simply aren't built to function at the cruising altitude of a 747." 

Read more ...

Un nuevo estudio de la Universidad de Washington que puso a prueba 65 vinos de los cuatro principales estados productores de vino de Estados Unidos, California, Washington, Nueva York y Oregon, ha encontrado que todos los vinos, excepto uno de ellos, tienen niveles de arsénico que superan lo permitido en el agua potable.

La Agencia de Protección Ambiental de Estados Unidos permite que el agua potable contenga no más de 10 partes por mil millones de arsénico. Las muestras de vino variaron de 10 a 76 partes por mil millones, con un promedio de 24 partes por mil millones.

Read more ...

Higher temperatures result in Swedish sand lizards laying their eggs earlier, which leads to better fitness and survival in their offspring, according to research published in the open access journal BMC Evolutionary Biology.

The findings indicate that climate change could have positive effects on this population of high-latitude lizard, but the authors warn that climate change is likely to affect a whole suite of traits, in addition to egg-laying date, which together would have an unknown combined effect on survival and reproductive success.

Read more ...

Thirty-one percent of cactus species are threatened with extinction, according to the first comprehensive, global assessment of the species group by IUCN and partners, published today in the journal Nature Plants. 

This places cacti among the most threatened taxonomic groups assessed on The IUCN Red List of Threatened Species™ - more threatened than mammals and birds.

Read more ...

More Articles ...

Subcategories