«The natural climate system has changed since the onset of the anthropogenic era,» he said. (sciencedaily.com)
Among their effects is their role in altering atmospheric and ocean circulation features away from what they would be in the natural climate system [NRC, 2005]. (dotearth.blogs.nytimes.com)
The study claims to have measured feedback, and have found feedback to temperature changes in the natural climate system to be negative — opposite of the assumption of strong positive feedback in climate models. (climate-skeptic.com)