Charles Keeling is the man who first discovered that carbon dioxide levels in the atmosphere were increasing and had been doing so for over a period of more than 30 years. The classic theory of the Greenhouse Effect predicts that as atmospheric CO2 increases, so should average global temperature. But so far this has not happened. Opinion is mixed as to whether the increased CO2 will bring about catastrophic changes to the world climate or whether the planet's natural feedback loops will manage to regulate any adverse effects.

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