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Powerful aftershocks rocked Nepal on Sunday, panicking survivors of a quake that killed more than 2,300 and triggering fresh avalanches at Everest base camp, as rescuers dug through rubble in the devastated capital Kathmandu.

A string of earthquakes have been occurring in Chile and Southern California. 

As if melting ice in Polar bears' Arctic habitat was not enough, Norwegian scientists have found that organic pollutants such as pesticide residues are disrupting their thyroid and endocrine systems, adding a further threat to the species' survival.

Brains age, just like the rest of the body, even for those don't get neurological disease, according to an Institute of Medicine.

"Some of the changes that one observes doesn't mean that it's all over, gloom and doom," the committee’s vice chair, Kristine Yaffe, MD, told the Washington Post.

​While aging does more damage to some than others, most people can take steps to improve their health, according to Yaffe, the Roy and Marie Scola Endowed Chair and professor of psychiatry, neurology, and epidemiology at UCSF and chief of geriatric psychiatry and director of the Memory Disorders Clinic at the San Francisco VA Medical Center.

Cada año, el Día de la Tierra (el 22 de abril) se conmemora el aniversario de lo que muchos consideran el nacimiento del movimiento ambiental moderno en 1970.

Con la moda hippie y la cultura flor-niño en los Estados Unidos, 1970 trajo la muerte de Jimi Hendrix, el último álbum de los Beatles y Simon & Garfunkel con "Puentes sobre ríos revueltos". La protesta estaba a la orden del día, pero la salvación del planeta no fue la causa. La guerra en Vietnam hacía estragos y los estudiantes en todo el país se opusieron a ella cada vez más.

High elevation environments around the world may be warming much faster than previously thought, according to members of an international research team including Raymond Bradley, director of the Climate System Research Center at the University of Massachusetts Amherst. They call for more aggressive monitoring of temperature changes in mountain regions and more attention to the potential consequences of warming.