Carbon Credits were discussed a few years ago to promote investment in technology. There was too much resistance (of course) and some folks complained that alternatives didn't exist. That argument is moot now, and clearly we need to emphasize the stick over the carrot now.
Just KevinHe emitted over 20 tons of CO2 on Sunday in order to spend four hours in Burbank. Come on people, we need to push for carbon taxes! Carbon taxes are wealth taxes too if you want to think about it that way. I think that $200/tonne would add like $2/gallon cost and seems like a fine start.