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1. Danish scientists have discovered that the earth`s climate regularly swings between warm and cold periods and that this "climatic clock" is almost entirely driven by changes in the sun
2. They confidently say that there exist cold periods that last for 40 years. Remember, for example, the "little ice ages" of the fifteenth and seventeenth centuries, when the Thames often froze over in winter. We were experiencing such a period in the second half of the twentieth century. Now the climate is slowly thawing out and by 2010 temperatures will be back to about the level of the 1960s.
3. After that there will be another plunge into a cold age. No one now living is likely to experience a return to the warm summers and winters typical of the first half of this century, when the climate was in one of its warm periods.
4. Climatologists have made similar forecasts before, but the Danish prediction is more remarkable. It is based on a detailed and unbroken record of the past climate spanning probably 100,000 years. This is a 4,700 ft rod of ice dug up from the entire thickness of the North Greenland ice sheet by United States Army engineers.
5. Concentrations of oxygen isotopes at different depths in the ice are a key to the temperature at the time when the ice was laid down as snow. The scientists discovered that there exists a fairly regular series of cold and warm swings. They also found that the main factors producing the swings are four slow rhythms in the sun`s activity.
6. Two of them are very slow changes, taking 2,400 and 400 years to complete one oscillatoin. No one knows what causes them. The other two are faster, taking only 181 and 78 years, and are probably tied up with variations in the length of the siuspot cycle, which is normally 11 years.