A decade ago, Dan Benjamin wrote that tradable permits seem to offer the advantages suggested by their proponents: “The total costs of achieving the current SO2 cap are at a minimum—and surely lower than under command-and-control. Perhaps now some serious consideration will be given to environmental protection systems in which there is even less administrative control by the government.”
Indeed, this scheme was considered by most economists to be the poster child of cap and trade. As Terry Anderson and Gary Libecap write in the Daily Caller by 2007 annual SO2 emissions dropped to 8.95 million metric tons at a cost of $747 million, “one-third less than it would have cost had the EPA used standard command-and-control regulation. The system worked beautifully—for a while.”
Today, however, the sulfur dioxide scheme is dead. The cause of death, according to Anderson and Libecap, is regulatory manipulation.
The Clean Air Interstate Rule and subsequent rules from the Obama administration have significantly undermined the sulfur dioxide trading scheme by preventing the use of 12 to 14 million pre-2010 banked allowances for future trading and changing the ratio of allowances per ton of sulfur emissions from 1:1 to 2:1 for 2010–2014 and to 2.86:1 for 2015 and beyond.
Not surprisingly, sulfur dioxide allowance prices began falling in 2005 from $1,600 per allowance and hit an all-time low in April of $0.56 on the spot market and $0.12 on the seven-year future market. For all intents and purposes, the EPA’s taking of banked allowances and manipulation of the trading ratio wiped out billions of dollars worth of assets held in the form of allowances.
The original SO2 trading scheme, according to Benjamin, had some characteristics of property rights; for example, anyone was legally permitted to buy or sell allowances at market-determined prices: “Because the allowances are standardized (each represents the right to emit one ton of SO2) and the major potential traders (electric utilities) are likely to be well-informed, trade should be feasible at low transaction costs, just as we find in stock and bond markets.” But as Anderson and Libecap state, when allowances are not treated as property rights and are “given and taken at the whim of regulators,” the system fails.


The increasing scarcity of water around the world prompts heated debate over the effectiveness of conservation efforts and policy initiatives.
Branding cattle and horses carries important lessons for environmental problems, namely that we should move towards greater branding of transitory resources, particularly air and water. This would help both the white hats, people who behave responsibly, and constrain the black hats, the villains that dump their waste on other people’s property. PERC has outlined how this can be done
After 50 years, Silent Spring is rarely read, but it is routinely cited as a canonical work in environmentalism. Rachel Carson is hailed as a near saint in the environmental movement. There is no doubt the book played a major role helping to spur the environmental movement in the 1960s.






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