Climate Study Finds Earth Warming Faster Than Previously Thought
"I think these results suggest that our need to do something about climate change is perhaps even more urgent," David Stainforth, the chief scientist in the study, says. "However, with our current state of knowledge, we can't yet define a safe level [of carbon dioxide] in the atmosphere."
Results from the study indicate that atmospheric carbon dioxide levels at 400 ppm would be considered "dangerous," though there's no consensus on what "dangerous" really means. The current level of CO2 in the atmosphere is 378 ppm, and rising at a rate of 2 ppm per year. By that reckoning, the Earth will reach that "dangerous" level in 11 years, assuming the increases remain steady.
Sources: BBC, Slashdot