WARMING OF WORLD’S CLIMATE EXPECTED TO BEGIN IN THE 80’S
WASHINGTON, Jan. 6— Mankind’s activities in increasing the amount of carbon dioxide and other chemicals in the atmosphere can be expected to have a substantial warming effect on climate, with the first clear signs of the trend becoming evident within this decade, a scientist at the National Aeronautics and Space Administration said here today.
The changes are in prospect because of excess carbon dioxide put into the atmosphere as humans burn coal, gas, oil and wood and cut forests for agriculture and other purposes. More recently there has also been an atmospheric buildup of methane, nitrous oxide and other chemicals as a result of agriculture and industry, said Dr. James Hansen of the space agency’s Goddard Institute for Space Studies in New York.
That would mean that 70% of the hockey stick is natural variability.