When/How/Where/Why Co 2 tax?!

Hello, I just read that in early 2009 the Co 2 tax should come. Somehow I found at the google nix exact about it. Can it be that there are no exact designs for it yet?! Where can I find a hint how much Co2 my car consumes, or how it is then classified later. In a table you could see that diesel drivers, well noted with PF have a big advantage over the PS equally strong gasoline engines, because they have a smaller Co2 We That can’t be true, can it?! Drivers will have a disadvantage by that I would say… Greeting Martin