The Continuing Demise of the Little Ice Age
Akasofu, S.-I. 2010. On the recovery from the Little Ice Age. Natural Science 2: 1211-1224.
Akasofu (2010) addressed the same subject in a similar manner, but with the benefit of nearly a quarter-century of additional temperature and CO2 data, plus a greater variety of other pertinent data, employing "openly available data on sea level changes, glacier retreat, freezing/break-up dates of rivers, sea ice retreat, tree-ring observations, ice cores and changes of the cosmic-ray intensity, from the year 1000 to the present."
Utilizing such data, the founding director of the International Arctic Research Center of the University of Alaska Fairbanks (USA) was able to demonstrate that Earth's recovery from the Little Ice Age (LIA) "has proceeded continuously, roughly in a linear manner, from 1800-1850 to the present," with the rate of recovery being about 0.5°C/century. Thus, he suggests that the Earth is "still in the process of recovery from the LIA," which is being brought about by whatever was responsible for the mean linear warming of the 20th century, as modulated by a "multi-decadal oscillation of a period of 50 to 60 years" that is superimposed upon it and which "peaked in 1940 and 2000, causing the halting of warming temporarily after 2000."
Extending these two phenomena into the future, Akasofu predicts the temperature increase over the 21st century to be 0.5°C ± 0.2°C, rather than the much greater 4°C ± 2°C that is predicted by the Intergovernmental Panel on Climate Change. Only time will tell who is right.
Idso, S.B. 1988. Greenhouse warming or Little Ice Age demise: A critical problem for climatology. Theoretical and Applied Climatology 39: 54-56.