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Discontinuity in the dose-response relationship is a frequent phenomenon for many kinds of pollution. A typical example is the release of a toxic agent in a river. At low to moderate levels, an increase in concentration will cause a proportional increase in the mortality of fish. Beyond a certain threshold, however, there is a jump to a new state and nearly all fish die.

We might be reaching such a threshold for climate gases, as the earth system's capacity for taking up CO2 is diminishing. See this guardian article.

by nanne (zwaerdenmaecker@gmail.com) on Fri Oct 26th, 2007 at 09:51:10 AM EST
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