User:William M. Connolley/Att
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Attribution_of_recent_climate_change says Attribution of recent change to anthropogenic forcing is based on the following facts:
- The observed change is not consistent with natural variability.
- Known natural forcings would, if anything, be negative over this period.
- Known anthropogenic forcings are consistent with the observed response.
- The pattern of the observed change is consistent with the anthropogenic forcing.
but doesn't really back this up. So...