Numerous, abrupt, short-lived warming and cooling episodes, much more intense than recent warming/cooling, occurred during the last Ice Age, none of which could have been caused by changes in atmospheric CO2.
Climate changes in the geologic record show a regular pattern of alternate warming and cooling with a 25-30 year period for the past 500 years.
Strong correlation between solar changes, the PDO [Pacific Decadel Oscillation], glacier advance and retreat, and global climate allow us to project a consistent pattern into the future.
Projected cooling for the next several decades is based on past PDO patterns for the past century and temperature patterns for the past 500 years. Three possible scenarios are shown: (1) global cooling similar to the global cooling of 1945 to 1977, (2) global cooling similar to the cool period from 1880 to 1915, and (3) global cooling similar to the Dalton Minimum from 1790 to 1820.
Expect global cooling for the next 2-3 decades that will be far more damaging than global warming would have been.