Politicians must consider unintended consequences

It's become a recurring, frustrating pattern, as legislators and regulators ignore the immutable laws of unintended consequences, to drive political agendas or aid favored constituencies, while harming others. A good example is corporate average fuel economy (CAFÉ) standards on vehicles. Originally enacted in 1975 to offset the impacts of the OPEC oil embargo and US oil price controls, and slow the rapid depletion of oil reserves, the mileage standards grew increasingly stringent. During the Obama years, the earlier justifications were replaced with claims that a vastly tougher 54.5 mpg standard would somehow help prevent "dangerous manmade climate change." However, EPA's own analysis showed that the new mileage standard would have brought emission reductions of a barely perceptible 3 billion tons of CO2 over the lifetime of vehicles covered by the new standards--out of an estimated two trillion tons of CO2 emitted worldwide during the same period.