All right. They use biomass. We have looked at this possibility at previous meetings. Agricultural biomass is not really viable, as it is used to fertilize the soil. You could perhaps bring in forestry biomass, but that would entail other problems.
Since gasoline and diesel are already exempt, wouldn't logic dictate that propane and natural gas also be exempted because they produce, at least theoretically, less pollution? I have the same question for Mr. Green, who has also spoken about this issue. Ms. Turcotte, let's start with you. What are your thoughts on this?