The Airships of the Future

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The Airships of the Future
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Via NY Times:

"Stratospheric airships could give us spacelike conditions from a spacelike platform, but without the spacelike costs," said Sarah Miller, an astrophysicist at the University of California, Irvine.

High-altitude airships are still in their relative infancy. None has ever flown at 65,000 feet for longer than eight hours. But a recent study from the Keck Institute for Space Studies at Caltech suggests that a more capable airship may not be far-off...

Is Climate Change Becoming Irreversible?

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Is Climate Change Becoming Irreversible?
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Via MNN:

Global warming is fueled by human activities, it's escalating quickly and some of its worst effects are probably irreversible. Those are the grim conclusions in a leaked draft of a major new United Nations report on climate change, scheduled to be formally released in early November.

"Human influence has been detected in warming of the atmosphere and the ocean, in changes in the global water cycle, in reduction in snow and ice, and in global mean-sea-level rise; and it is extremely likely to have been the dominant cause of the observed warming since the mid-20th century," the unfinished 127-page draft states, as reported by the New York Times. "The risk of abrupt and irreversible change increases as the magnitude of the warming increases."