An independent study quantifies the human and natural contributions, with solar radiation contributing only minimally
Quinn Schiermeier and Nature Magazine
Scientific American, 5 december 2011
Natural climate variability is extremely unlikely to have contributed more than about one-quarter of the temperature rise observed in the past 60 years, reports a pair of Swiss climate modelers in a paper published online December 4. Most of the observed warming—at least 74 percent—is almost certainly due to human activity, they write in Nature Geoscience.
Phi Beta Iota: Yes BUT! First off, Environmental Degradation, high-level threat number three, includes Climate Change, which is less than 10% of Environmental Degradation (and within Climate Change, carbon is vastly less important than mercury or sulpher). Secondly, the real looming catastrophes are man-made increases in the frequency and severity of weather. We have destroyed the earth’s natural feedback loops and self-correcting mechanisms.