Fenomenalmente duraderos, los cristales llamados circones son utilizados para fechar algunos de los primeros y más espectaculares cataclismos del sistema solar. Uno de ellos es la súper colisión con la que se expulsó material de la Tierra para formar la Luna, aproximadamente 50 millones de años después de que se formó la Tierra. Otro es el intenso bombardeo tardío, una ola de impactos que pueden haber creado condiciones infernales en la superficie de la joven Tierra, hace unos 4 mil millones de años.

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Esta semana la directora de la EPA Gina McCarthy se unió a líderes de los sectores público y privado para una segunda mesa redonda anual de la Casa Blanca sobre los progresos realizados y las nuevas medidas adoptadas para limitar las emisiones de hidrofluorocarbonos (HFC), los potentes gases de efecto invernadero usados ​​en refrigeración y aire acondicionado. La directora McCarthy anunció varias acciones nuevas que la agencia tomará para ayudar a apoyar una transición sin problemas a las alternativas inocuas para el clima a los HFC.

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The good news for Volkswagen is that it delivered almost 7.5 million vehicles to customers during the first three quarters of 2015. The bad news is that 8.5 million of VW’s cars will most likely be subject to a mandatory recall — and that’s just in Europe.

The fallout from the Volkswagen emissions scandal continues to reverberate, four weeks after revelations about the installation of “defeat device” software in diesel-powered cars slammed the newswires. Now, the world’s largest automaker is facing a global public relations crisis. This includes its home base: 2.8 million of the recalled vehicles were sold in Germany.

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Diesel fumes may be reducing the availability of almost half the most common flower odours that bees use to find their food, new research has found.

The new findings suggest that toxic nitrous oxide (NOx) in diesel exhausts could be having an even greater effect on bees’ ability to smell out flowers than was previously thought.

NOx is a poisonous pollutant produced by diesel engines which is harmful to humans, and has also previously been shown to confuse bees’ sense of smell, which they rely on to sniff out their food.
 

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Los científicos han predicho que la aparición de crecimiento de las plantas de primavera se desplazará por una mediana de tres semanas antes, durante el próximo siglo, como resultado del aumento de las temperaturas globales.

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Researchers in the United States have found that hormonal changes in women during the menopause can cause so-called ‘good cholesterol’ to become dangerous to their health. EurActiv France reports

'Good cholesterol' usually protects the arteries by helping to transport 'bad cholesterol' to the liver to be processed. But recent research in the United States suggests that the risk of heart disease in women increases dramatically after the menopause, because even good cholesterol becomes harmful.

According to the ten-year study carried out on 1,054 American women by Karen Matthews, of the University of Pittsburgh, women's cholesterol levels tend spike after the menopause, placing them at greater risk of cardiovascular events.

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