«We're already at the outward bounds of natural variability,» Dr. Tudhope said, explaining that the global average temperature is now as warm as it has been for tens of thousands of years. (nytimes.com)
But this is the first time that any study has found that a weather event was so extreme that it was outside the bounds of natural variability — let alone three such events, Herring said. (sciencenews.org)
«Once natural systems exceed the bounds of natural variability, there is greater potential for rapid and unpredictable change,» says Sutton. (newscientist.com)