> Using petrol on personal transportation is such a waste. I'd like to see a heavy carbon tax so that this fantastic, but finite, resource would be directed to things where it really adds value.

Forgive me if I respect the decentralized distributed thinking of 6 billion people, including millions of economists, engineers, materials scientists, etc., over one random commenter on HN, but I personally have no reason what-so-ever to believe that your judgement that the ROI on oil is higher in plastics mfgr than in transport.