“The TPP as it stands does not even require member nations to uphold commitments to global environmental agreements, such the Convention on International Trade in Endangered Species (CITES). Criticism of the TPP goes well-beyond environmental issues, however. Many groups have complained of the investor-state settlement agreement in the plan that allows corporations to sue countries when contracts are breached. Critics of this model say it benefits foreign investors as they expense of human rights, working conditions, and the environment. Negotiations have also been blasted for being held completely behind closed doors, with some U.S. Senators complaining that multinational corporations are privy to the negotiations while the U.S. Congress is left in the dark.” (Source)
Learn more about the TPP by checking it out on Wikileaks.