Will a 'Green Tax' reduce emissions?

The city I live in is booming, and as a result, most people here have more money than brains these days. Which means, of course, that the majority of people drive large, gas-guzzling SUVs because they look pretty, and, well, they can afford it. A concern for the environment doesn't come into play at all.

But would a green tax change all that? In Britain, they're talking about implementing higher charges for people who choose to drive environmentally un-friendly vehicles, which would include higher purchase taxes as well as higher driving taxes. The move is expected to cost families an extra £1000.

What do you think about green taxes for high-emission vehicles? I think it's a great idea, but you probably gathered that already.