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According to Dr. Kenneth Trenberth of the U.S. Climate Analysis Section for Atmospheric Research, the ratio of record hot to record cold days in North America prior to the 1970's was 1:1. According to NASA, in the last 400,000 years until 1950, CO2 concentrations never exceeded 300 ppm.

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Bibliographic Details
Published in:Natural resources & environment 2012-07, Vol.27 (1), p.64
Format: Magazinearticle
Language:English
Subjects:
Climate change
Dams
Global warming
Greenhouse gases
Online Access:Get full text
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Summary:According to Dr. Kenneth Trenberth of the U.S. Climate Analysis Section for Atmospheric Research, the ratio of record hot to record cold days in North America prior to the 1970's was 1:1. According to NASA, in the last 400,000 years until 1950, CO2 concentrations never exceeded 300 ppm.
ISSN:0882-3812
2328-3408