I think if the regular measures seem to be not working as well as they should be than there should be some sort of readjustment and market mechanisms might prove to be worth considering mainly because it makes a lot of sense and seems to be a well thought of concept.
We have let big businesses slide by for far too long. We are very very slowly, but surely coming to see the effects we have had on our environment as a country. There are statistics on the carbon emission output by different developed countries, so clearly there is a concern somewhere. It's time we do something about it. It's time we stopped worrying about our wallets for just a second and make sure that our planet doesn't implode beneath us.