Arctic ice: Now you don't | The Economist - 0 views
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The summer sea ice is shrinking so much mostly because greenhouse warming is raising Arctic temperatures. This has direct effects: when the air is warmer, more ice melts. It also has indirect effects. Warm, salty water from the North Atlantic sliding below the cold, fresh upper layers of the Barents Sea may be one of them. Another could be that warmer air is often moister. Moist air traps more heat in summer. In winter it tends to create more clouds, which keeps the surface below warm.
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ice-albedo effect:
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The melt is happening much faster in reality than it does in computer programs.
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Legalising marijuana: The view from Mexico | The Economist - 0 views
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AMERICAN elections are watched closely in Mexico, which sends most of its exports and about a tenth of its citizens north of the border.
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On the same day, voters in Colorado, Oregon and Washington will vote on whether to legalise marijuana—not just for medical use, but for fun and profit.
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he impact on Mexico could be profound. Between 40% and 70% of American pot is reckoned to be grown in Mexic
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