Look back, taking history as a mirror. For the study of history will give us configuration of water and other resources to provide decision basis for the future, so as to better prepare the climate change.
"We need more in-depth understanding of ancient weather system and its change rule, this may help to understand modern weather conditions." The Swiss federal institute (located in Zurich) of the ancient climatologists Woolf · field-glass root said: "it does not provide any prediction, but this is by far the factors we must take into consideration."
The field-glass root and his colleagues cooperation, and archaeologists together, collected more than 2,500 years ago 9,000 slice pieces of information, and gathering trees into a database. These fragments from some since living trees, wood and buildings, of the samples from France and Germany in the land. Through evaluating timber rings, researchers can determine the width of the previous year temperature and rainfall.
In order to understand the status, they each year temperature was measured at high altitudes growth coniferous rings. These areas of trees in the warm summer grow faster, and in the cold season grow slower, this difference in ring width of obvious response.
In order to understand annual precipitation, they measured the growth in low altitude area of an oak tree rings width. These trees in rain drenched season growth faster. The existing technology can help them find every annual rings represent which year.
Data again and again shows that climate has produced dramatic of cultural influence. For example, the 250 A.D. 55 years during, frequent extreme weather, weather patterns change frequent and intense. This also comes at a European political, economic situation turmoil of the special period.
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