Let's see how much of carbon a Proton releases for every single km it moves:
Average Car Carbon Emission in European Union Countries = 160 g/km
Target for 2012 = 120 g/km
Target for 2020 = 80 g/km
Proton Gen-2 Carbon Emission = 157 g/km (ranges from 131 to 192 g/km for other models)
Proton Waja/Impian Carbon Emission = 167 g/km (manual transmission) 172 g/km (auto transmission)
Proton Satria Neo Carbon Emission = 177 g/km
Proton Savvy Carbon Emission = 134 g/km
Proton Waja and Proton Satria Neo beat the average car carbon emission in Europe. Seems like Proton Savvy is the greenest of all (not so green though) at 134 g/km considering that it is only a 1200 cc.
Getting the picture
If you drive your car 10,000 miles per year and have an average polluting car (i.e 160g/km of carbon emissions) then every year your car will emit 2.6 tonnes of Carbon Dioxide. If you wish it offset this amount by planting trees you would need to plant at least 4 trees for every year you spend driving the car.
Proton's cars are not so green. In fact, there are no information regarding carbon emission in Proton's official website or Proton's brochure. It is only mentioned "Low carbon emission" in the sales brochure. Well, not so low after all!
Carbon emission sources: Green Consumer Guide