Carbon Trading - bureaucratic nightmare and fraudster's paradise

Whoever thought up the crazy idea of carbon trading is a card-carrying member of the bureaucratic, undemocratic and technocratic 'elite' that rules over us. Some 'academics' are always happy to support new schemes (think Tobin Tax) and cosy up to their political paymasters. A naive press also toes the official line in most instances.
But we have a long-established 'Carbon Tax' - it is levied in nearly all countries on the use of petrol and could easily extended to any oil and coal use. And it is not obvious why air transport, shipping and agriculture should be treated leniently. Or the heavy industry which gets also treated with kid's gloves in many countries.
Carbon tax an unwanted gift?