http://www.second-opinions.co.uk/looming-threat-of-global-cooling.html

Global warming is real, but it did not begin in 1945 at the time of greatly increased CO2 emissions. Two periods of global warming (1915–1945 and 1977–1998), and two periods of global cooling (1880–1915 and 1945–1977) occurred in the 20th century. Atmospheric CO2 began to rise sharply right after WWII in 1945 but was accompanied by global cooling for 30 years, rather than by warming, and the earlier warm period from 1915 to 1945 took place before CO2 began to rise significantly.
During each of the two warm periods of the past century, alpine glaciers retreated and during each of the two cool periods glaciers advanced. The timing of the glacier advances and retreats coincides almost exactly with global temperature changes and with Pacific Ocean surface temperatures (PDO).
The Pacific Ocean has two modes, a warm mode and cool mode, and regularly switches back and forth between modes in a 25-30 year repeating cycle known as the Pacific Decadal Oscillation (PDO). When the PDO is in its warm mode, the climate warms and when it is in its cool mode the climate cools. Glacier fluctuations are driven by climatic changes, which are driven by ocean surface temperatures (PDO).