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Observed Variability
Global mean temperature varies significantly
- +/- 2.1˚ C seasonal variability
- +2.1˚ in June, -2.1˚ in December
- Sun is closest in early January, farthest in July
- Global mean temperature changes oppositely
- Indicates dramatic hemispheric asymmetry
- Unambiguously supports Milankovitch forcing
- Data calibration error around 2001-2002
- This has been misinterpreted as 'evidence' of warming
Notes:
The Milankovitch hypothesis states that climate change is a consequence of asymmetries between hemispheres and variability in the Earths orbit and axis. This is widely disputed by global warming alarmists who universally prefer the CO2 forcing hypothesis. However, the data provides very strong support for the Milankovitch hypothesis and none at all for anthropogenic forcing.
There are several issues with the collection and calibration of the satellite weather data. In many cases, anomalies have been claimed to support the anthropogenic forcing hypothesis. Care must be exercised to insure that these issues are properly considered. All are documented in the ISCCP data set documentation, although it's not always easy to find and correlate documented errors to specific data anomalies and is why data anomalies are often misrepresented as warming trends.