You've probably already seen the grim news about overfishing: scientists predict that world food fisheries could collapse by 2050, if current trends continue. That's because 3/4 of the world's fish stocks are being harvested faster than they can reproduce; 80 percent are already fully exploited or in decline; and in addition 90 percent of all large predatory fish are already gone. But the picture gets worse: every year, the U.S. fishing industry throws about 2 billion pounds worth of fish back into the water. A report released last month by Oceana estimates that this amounts to an annual loss of one billion dollars.
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The Milky Way may have found a solution to its gas shortage. Astronomers had calculated that our home galaxy possesses only enough fuel to forge new stars for just a few billion more years. But scientists have now discovered that a long stream of gas falling into the Milky Way is four times as massive as previously thought and could power our galaxy's starmaking career for a long time to come. "It's a very beautiful study with surprising results," says Leo Blitz of the University of California, Berkeley, an astronomer who was not part of the project.
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With the focus on reducing carbon emissions, we often forget about methane – another greenhouse gas that is way more powerful as an atmospheric pollutant than carbon dioxide. Methane emissions can come from industry, agriculture, and waste management activities, but can also be emitted from a number of natural sources. One newly discovered natural source: SAR11.
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Professors Jesse Thé and Roydon Fraser from the University of Waterloo are initiating a study on the potential cause of the decade long pause on global warming. This is an interview with Prof. Thé, as a disclosure is also ENN’s Editor-in-Chief. . ENN: What is causing this decade long pause on the average global temperature increase? Prof. Thé: First of all, note that the last decade was the warmest on record. While the maximum temperatures are not increasing as fast, we are not seen a real pause on temperature increase, just a significant reduction on its growth rate. Second, researchers are not certain and our work at this stage can only be placed in the scientific method as a hypothesis. Until we develop the full analysis, all my views in this interview are based on our hypothesis that the pause in the temperature increase is cause by the aerosol formation form the massive burning of coal in China (50% of global consumption of coal) and India.
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Hay mucho más en tratar de frenar el cambio climático que sólo reducir las emisiones de gases de efecto invernadero. Tecnología, políticas o planes que apuntan a ello también deben tomar en cuenta factores ambientales tales como el consumo de agua. Un enfoque más integral podría tener algunas opciones mucho más atractivas que otras, especialmente cuando se implementa en los países áridos, tales como Australia, sugieren Philip Wallis y sus colegas de la Universidad de Monash en Australia, en un artículo en la revista de Springer Climatic Change.
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Litter is now found in even the most remote areas of the oceans, say scientists trying to understand how much rubbish is lying at the bottom of Europe's seas. The new study, published in Plos One, shows for the first time that there seems to be no area of the ocean left untouched by human litter. Using 588 video clips collected by unmanned submarine vehicles for geological mapping and marine biology studies, the team found that plastics waste like shopping bags is the most prevalent.
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