Aleutian low

Clandestine Cause of Global Warming

Natural cycles ALWAYS change climate. One of the biggest cycles is the Pacific Decadal Oscillation (PDO). It shifts from warm to cold every 20-30 years, or on an inter-decadal time scale. This is directly related to sea surface temperature. The PDO’s temperature variance over more than 100 years can be viewed in the graph below. A common thread to PDO and climate is unmistakable.                       Both graphs below are from Wikipedia.

Observed monthly values for the PDO (1900–2010).



Even though the Atlantic is a significantly smaller body of water than the Pacific, it has similar effects on climate. It has what is typically known as the Atlantic Multidecadal Oscillation (AMO). It has a quasi-cycle of warm to cold every ~70 years. Both the PDO and AMO are directly affected by other natural cycles.

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