Tsunami earthquakes happen at relatively shallow depths in the ocean and are small in terms of their magnitude. However, they create very large tsunamis, with some earthquakes that only measure 5.6 on the Richter scale generating waves that reach up to ten metres when they hit the shore. A global network of seismometers enables researchers to detect even the smallest earthquakes. However, the challenge has been to determine which small magnitude events are likely to cause large tsunamis.
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The Center for Biological Diversity will file a legal challenge to an Obama administration policy, finalized today, that severely limits when a species qualifies for protection under the Endangered Species Act - a change that ignores both broad legal precedent and congressional intent. Under the Act a species qualifies for protection when it is "in danger of extinction in all or a significant of portion of its range."
Both Congress and the courts have explained that the "significant portion of range" provision is vital for important conservation because it allows federal wildlife agencies to protect species before they are at risk of going extinct globally. But the newly finalized policy sharply restricts the use of this part of the Act, defining "significant" to mean that only when the loss of a part of a species' range threatens the survival of the whole species would wildlife agencies protect that species under the Act.
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Mining for precious metals like gold, silver, and copper is extremely costly. Not only does it require a huge amount of energy and have a devastating impact on the environment, it also puts human life at risk.
Still, these metals are what enable our precious smartphones and tablets to work so efficiently, so we have to get them from somewhere. But what if that somewhere was old gadgets we no longer want instead of deep within the Earth?
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Las mujeres embarazadas que vivÃan en las proximidades de campos y granjas donde se aplican pesticidas quÃmicos experimentaron dos tercios de mayor riesgo de tener un hijo con trastorno del espectro autista o de otro retraso en el desarrollo, según revela un nuevo estudio.
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For decades, climate scientists have tried to explain why ice-age cycles became longer and more intense about 900,000 years ago, switching from 41,000-year cycles to 100,000-year cycles. In a new study in the journal Science, researchers found that the deep ocean currents that move heat around the globe stalled or even stopped, possibly due to expanding ice cover in the north. The slowing currents increased carbon dioxide storage in the ocean, leaving less in the atmosphere, which kept temperatures cold and kicked the climate system into a new phase of colder but less frequent ice ages, they hypothesize.
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