The rainforest consists of several layers. Each layer has plants and animals which are adapted to the conditions found there. In the ground layer, soil is poor and any nutrients are quickly recycled. The next layer is made up of shrubs and plants which can tolerate low light levels. The lush undercanopy consists of smaller trees which compete for the light and space. Epiphytes are found in the undercanopy.
In additon. biofuels may be marketed as good, renewable, sustainable or next generation, partly for promotional purposes. So achieving a widely accepted definition of advanced and/or sustainable biofuels is a challenge. Often the term is applied to biofuels produced from lignocellulosic (LC) or cellulosic biomass.io-oil can be used as a heating fuel or can be further converted to advanced biofuels. Torrefaction (heating at 200-300 Â°C in the absence of oxygen, at atmopsheric pressure) converts biomass to bio-coal, which can be more easily used for power generation than untreated biomass.
Biofuel mandates are not just for the United States. Biofuels are supported by many governments throughout the world. Posted on February 25, 2013 by  Mark Seamon, Michigan State University Extension. The United States has adopted policies to mandate the use of biofuels in blends with petroleum fuels. The primary policy that details the volume of biofuels that must be used in the United States is the Renewable Fuels Standard (RFS). The RFS was created in 2005 and was expanded by the Energy Independence and Security Act.