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...just one problem: that's not how climate change is likely to unfold. Instead, scientists worry about potential tipping points - triggers that, once reached, could lead to sudden and irrevocable changes in the climate, almost without warning. It's the same phenomenon of sudden collapse that can be seen in any number of complex systems that seem perfectly stable, until they're not - ecosystems, financial markets, even epileptic seizures. The trick is to identify the warning signs that indicate a tipping point - and collapse - are about to be reached and to take action to avoid them. (Read "Heroes...
...temperatures to colder ones and back again. General instability ensues and, at some point, the center ceases to hold. "Before we reached a climate tipping point we'd expect to see lots of record heat and record cold," says Carpenter. "Every example of sudden climate change we've seen in the historical record was preceded by this sort of squealing...
...Dark Lord has entrusted the young Draco Malfoy with a daunting assignment that endangers the lives of multiple characters throughout the school year. Voldemort’s most formidable opponent, Headmaster Albus Dumbledore, has begun to show signs of increasing fragility, ominously symbolized by his injured hand. Hogwarts, once seen as a rare safe haven, begins to lose much of its structural integrity. Despite the film’s grim tone, the storyline isn’t all danger and darkness. After a two-year absence, Quidditch is back, and Ron Weasley (Rupert Grint) joins the Gryffindor team as Keeper...
...great sweep of history, this presidency has barely begun. The mistakes Obama has made are rookie mistakes that can be corrected. And the general tendency of his Administration - toward civility, as opposed to the ugliness we've seen in the past month - is the right one. But he can't allow his desire for civility to neuter the requirements of leadership. He has to lead, clearly and decisively, starting right...
...Correa administration said Tuesday that while it had thus far seen no evidence of government corruption in the videos, it would investigate the matter "thoroughly, aggressively and fairly." On Wednesday, Ecuadorian justice officials announced they were opening an investigation into the possible government corruption, as well as whether the videotaping had violated laws. In any event, the scandal promises to delay the completion of a trial that has already spanned two decades and two continents. It began in the early 1990s in New York, after settlers and indigenous tribes in the Amazon oil towns of Coca, Lago Agrio and Shushufindi...