The earth warmed strongly between 1915 and 1940, cooled between 1940 and 1975 and then warmed strongly again between 1975 and 1998. The earth has been cooling in the opening years of this century even as carbon dioxide levels have risen appreciably since 1998. Many influential people in the industrialized world believe that global warming is a transcendent issue and human activity, especially the activity of the energy complex, is to blame and carbon management, at any cost, is imperative.
A growing number of influential people in the developing world (this includes China, India, Indonesia, Vietnam, as well as Russia) are openly rejecting the idea that human activity has any measurable influence on the planetary climate or even that there is anything unusual or abnormal about the climate at present. Some of these people, joined by hundreds of scientists in the U.S. and Western Europe advance the idea that sunspot activity (which is cyclical) and the recently discovered (as recent as 1996) PDO (Pacific Decadal Oscillation: 20 to 30 year warming and cooling of the north-central Pacific Ocean) explain the cyclicality of global temperatures. According to those who hold this view, the planet has entered into a 30 year or so cooling period and carbon dioxide emissions even if they keep growing, cannot prevent this cooling.
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