A process, product, or service which reduces negative impacts on the environment while offering competitive returns for investors and customers. Clean technologies provide solutions which reduce energy usage, use sustainable resources, or protect the environment.
First generation biofuels include ethanol and plant oil produced from sugar and starch. Second generation biofuels are produced from non-food biomass called lignocellulose and are called cellulosic biofuels. Third generation biofuels are derived from algae and produce feedstock as well as fuel. Fourth generation biofuels are electrofuels or photobiological solar fuels.