[MichaelSalib]

Emissions trading regimes can be effective for some pollutants, but not others. I'd support them for CO2 because CO2 disperses rapidly and widely, but I oppose them for mercury emissions from coal fired power plants because mercury is much heavier and much more localized; in practice, an emissions trading regime for Hg would mean that children who grew up near power plants (i.e., poor children) would have much higher Hg exposure than richer children.