We need to be careful when we use the word "feasible" that we don't confuse it with "expedient". The opposition is strongest around the fee-and-dividend approach proposed by James Hansen precisely because it is by far the best approach that would make a meaningful difference in our society's wasteful use of fossil fuels. Fee-and-dividend is the most practical approach, but it will not be easy or convenient.
Once again, I have posted a petition on Care2 that calls for a global carbon tax based on Hansen's fee-and-divident proposal. You can view it (and hopefully put your name on it) at www.thepetitionsite.com/286/384/042/petition-for-a-referendum-on-a-global-carbon-tax/