Are CO2 Emissions Worse Than We Thought?

Could it be that carmakers under estimate how much CO2 their cars and trucks emit? According to an investigation and tests by Auto Express, there is a huge gap between what carmakers say and what the true specs are: Auto Express’ findings mean top-selling cars could be contributing more to global warming than first thought. […]

Could it be that carmakers under estimate how much CO2 their cars and trucks emit? According to an investigation and tests by Auto Express, there is a huge gap between what carmakers say and what the true specs are:

Auto Express' findings mean top-selling cars could be contributing more to global warming than first thought. Ford's Focus 1.6, for example, officially puts out 161g/km of CO2. But it's more likely to emit 193g/km.

Furthermore, how do you measure emissions? And can tests be so accurate as to gauge emissions for all driving conditions and during the entire lifetime of a car?

[Source: Auto Express]