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<p>Crocker, Dales, Montgomery etc.) and, independent of the former, tinkering with "flexible regulation" at the US Environmental Protection Agency.<br/>
# Proof of Principle: First developments towards trading of emission certificates based on the "offset-mechanism" taken up in Clean Air Act in 1977. A company could get allowance from the Act on a greater amount of emission when it paid another company to reduce the same pollutant.<br/>
# Prototype: Launching of a first "cap-and-trade" system as part of the US <a href="page.php?w=Acid_Rain_Program">Acid Rain Program</a></p><p>
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