Yep. The problem with carbon tax is to get it implemented widely enough, so that you just don't displace the pollution to somewhere else. We have something similar today. In China it is nearly free to pollute, to have jobs with shitty work conditions. You could probably not run a factory in a country where the high tech goods (like iPhones) are being bought, the way you can in China. Because we don't have similar requirements for pollution, work environment etc. we have essentially pushed all the "unacceptable" behaviour to somewhere where it isn't "taxed" the same where as we would have. Maybe we just have to do it anyway, but it is going to be a problem.