Some "all you can eat" buffets in China discourage taking more than you can eat: they fine diners for wasted food, based on weight of discards.
A careful review of the food chain from seed to table finds many points where food is wasted for capricious reasons. Prospect Magazine http://bit.ly/88kDNx
MicroMidas technology converts carbon in organic wastewater into bio-plastics. A "Cleantech Open" winner 2009. http://www.micromidas.com.
Tracking garbage flows using barcodes or RFID tags helps design better systems and educate the public. http://www.nytimes.com/projects/magazine/ideas/2009/#w
Resomation (liquefication) uses less energy and produces less pollution. http://www.nytimes.com/projects/magazine/ideas/2009/#r
The Humanure Project in India uses biogas generators to produce electricity from human waste. Dell Social Innovation Challenge 2nd place (of 4000) 2012. http://bit.ly/Af5vGu
Waste incinerators which generate electricity have improved to the point where they are environmentally friendly. Economist review: http://econ.st/LJOwGX
Thiol-SAMMS is a white powder that if added to water, effectively binds to mercury for removal. 2009 Popular Science Green Tech Winner. http://bit.ly/4yLwv3
One in six Americans receives food assistance. Simultaneously the US wastes 40 million tons per year. There are many solutions. SSIR http://bit.ly/1qVaCAz
"Members save up to 70 percent on food that grocers have rejected due to mislabeling, damaged packaging, or nearing expiration dates". SSIR http://bit.ly/1qVaCAz
LeanPath provides software tools and systems to allow food workers to document and address food waste. http://www.leanpath.com/