I have never seen a more succinct and telling argument to refute carbon dioxide governed climate change than the following graph from a study by L.B. Klyashtorin pubished as a technical paper by the United Nation’s Food and Agricultural Organisation.
The study entitled ‘Climate change and long term fluctuations of commercial catches: possibilities of forecasting’ concludes that 60-year climate oscillations correspond to the regular fluctuations of the populations and catches of the main commercial fish species.
“Analysing roughly 30-year alternation of the so-called “climatic epochs” characterised by the variation in the Atmospheric Circulation Index (ACI), the study revealed two ACI-dependent groups of major commercial species correlated positively with either “meridional” or “zonal” air mass transport on the hemispheric scale.
“Climate periodicity serves as a basis for a predictive model of the population and catches of major
commercial fish species. The model has two basic limitations.
(1) It is applicable to the abundant fish species only (commercial catch > 1.0 – 1.5 million tons) yielded over large areas, such as North Pacific or North Atlantic as a whole;
(2) The model is intended to analyse and forecast the long-term trends in the population of major commercial species with the assumption that general intensity of commercial fisheries will stay at its average level over the last 20 – 25 years.
“The concept of generating forecasts of anthropogenic climate change and consequent changes in fish production is beyond the scope of this study. However, there is a clear link between fish production and climate, so projecting future climate changes is of importance. Not only can climate be used to forecast commercial fish yields, but also it may be possible to estimate general changes in biological production on the global scale. It is therefore important to maintain databases on routine fisheries data and climate indices in the long term, in order to track these critical processes.”
This study trashes most of the classic examples of fishery collapse due to overfishing. Incidentally, the Pacific Dedadal Oscillation (PDO) has this year switched into its cooler phase.
Anthropogenic global warming (AGW) catastrophists are now belatedly accepting natural influences on global temperature to explain the current cooling. If natural cooling is possible then warming must be also and a similar amount of natural influence to that now being attributed to cooling would reduce the greenhouse contribution to the previously observed warming to little or nothing. AGW is beginning to look like the more and more convoluted epicycles invented to maintain the geocentric theory before it finally had to be abandoned.
Klyashtorin L.B. 2001. Climate change and long term fluctuations of commercial catches: the possibility of forecasting. FAO Fisheries Technical Paper 410, 98p. FAO (Food Agriculture Organization) of the United Nations, Rome.