"The vehicle emits less than 140g/km of CO2 or operates on biofuels (in France), on E85 ethanol or on B30 biodiesel"
CO2 is the main culprit behind the greenhouse effect that threatens climate change. Through the use of fossil fuel, motor vehicles release large amounts of CO2 into the atmosphere.
Vehicles that emit less than 140g / km of greenhouse gases consume at least 47.9 mpg for a petrol engine or 53.3 mpg for a diesel engine.
Biofuels help reduce CO2 emissions as the plants used to create them absorb the CO2 in the atmosphere through photosynthesis.