Much of the CO2 released when biomass is converted to ethanol and burned in car engines is recaptured when new vegetation is grown, thus offsetting the greenhouse gas effect.
Une mŽthode radicalement diffŽrente de rŽduction des Žmissions en provenance des carburants fossiles consiste ˆ produire des rŽcoltes qui constituent une source dÕŽnergie de rechange.