Clause 20 of the Trans-Pacific Partnership agreement sounds pretty good. "The 12 Parties agree to effectively enforce their environmental laws; and not to weaken environmental laws in order to encourage trade or investment." What's not to like there?
All is not as it seems. While the TPP purports to uphold existing environmental laws, it may leave signatory nations incapable of passing new environmental enactments. Cracking down on carbon emissions, new carbon taxes, upgraded cap and trade schemes could all run afoul of corporate polluters who could sue for injunctions or compensation.