University of Birmingham: Scientists from the University's School of Biosciences have found a way of extracting hydrogen from confectionery wastes. The justification for your extensive craving for chocolate now becomes the goal of producing renewable energy.

E.coli bacteria will be used to process confectionery wastes (from chocolate factories) to ferment the sugars, generate organic acids, and convert formic acid to hydrogen. Once the hydrogen is generated, it can be collected and used to power a fuel cell (and produce water as a by-product).

Successful implementation of this technology could lead to a massive power plant construction in the Hersheys factory in Virginia (I think that is where it is). Read more about this story here.