Global Warming: The Balance of Evidence and Its Policy Implications

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Courtesy of TheScientificWorldJOURNAL

In 1957 noted climatologist Roger Revelle wrote: “Thus human beings are now carrying out a large-scale geophysical experiment of a kind that could not have happened in the past nor be reproduced in the future. Within a few centuries we are returning to the atmosphere and oceans the concentrated organic carbon stored in sedimentary rocks over hundreds of millions of years...”.

Revelle also encouraged David Keeling to make measurements of carbon dioxide (CO2) levels in the atmosphere. The resulting “Keeling Curve” shows dramatically the rise of CO2 above pre-industrial levels. Fig. 1 shows this rise from a combination of ice-core (pre-industrial), and atmospheric measurements as well as estimates of fossil fuel burning in recent times, which parallel the rise in CO2.

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