A few websites for Tidal/Biomass Energy

This website contains basic information about tidal energy and is an introduction to this particular source of renewable energy.

http://www.oceanenergycouncil.com/index.php/Tidal-Energy/Tidal-Energy.html

This pdf file goes into greater detail about tidal energy and also has a chart that details several locations, their potential amount of tidal energy, as well as the mean tide.

http://www.gcktechnology.com/GCK/Images/ms0032%20final.pdf

Ethanol and biodiesel general overview information.

http://biofuelguide.net/

Here is an article discussing biodiesel fuels, a short history, and an example of biofuel uses in action.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1817719/