Environmental information in the isotopic record in trees

Abstract
Twenty-three trees from widely different geographic locations and different environments were analysed for the 8D and 8 13 C records. The 8D values suggested that the temperature of the Earth’s surface rose over the past 100 years and probably for the past 1000 years. The rate of warming appears to be latitude dependent, greatest in the cooler areas. The 8 13 C record, obtained for seven of the 23 trees, contain the 8 13 C decrease due to the anthropogenic effect, the addition of CO 2 from coal and petroleum burning. This effect appears to be twice as high in the Northern Hemisphere as in the Southern Hemisphere.

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