Unit 1: Should we tax carbon?

Great collection of videos from tutor2u on the topic

http://www.tutor2u.net/blog/index.php/economics/comments/unit-3-micro-video-resources-on-carbon-taxation

a) Using a diagram, explain how a tax on carbon would reduce the market failure
b) Using information from the video and what we've covered in the lesson, comment on how likely such a tax is likely to be in reducing the market failure