However , many of the biofuels that are currently being supplied have been criticised for their adverse impacts on the natural environment , food security , and land use .
Biofuels , in the form of liquid fuels derived from plant materials , are entering the market .
Many of the biofuels that are currently being supplied have been criticised for their adverse impacts on the natural environment , food security , and land use .
Biofuels , in the form of liquid fuels derived from plant materials , are entering the market .