I'll start with the premise of your question, which I think is quite right. The policy motivation behind concluding these side accords on labour and the environment in our bilateral free trade agreements is precisely that. There is more than one motivator, I suppose, but one may be ensuring that investment isn't attracted and business isn't attracted to a market that has either lower environmental standards or less stringent labour requirements.
On September 29th, 2011. See this statement in context.