“This video reviews the history of solar cooking in Afghanistan and discusses the enormous potential of this simple solar thermal technology to save the forests, the children and the economy of Afghanistan.”
Mechanical
Frank Shuman’s Solar Arabian Dream
“On a clear, blazing hot day in June of 1913, the cream of British colonial society in Egypt—including journalists, ranking civil servants, and diplomats—gathered in Maadi, a small farming village on the banks of the Nile several miles south of Cairo, for the grand opening of a most unusual irrigation plant.
Rocket Mass Heater Failure
I love rocket stoves and mass heaters and have been recommending them for years. However, there are limitations to everything. Here’s a report from frigid Canada where a rocket mass heater wouldn’t work.
MittiCool Clay Refrig (Non-electric)
“A fridge for the common man that does not require electricity and keeps food fresh too. With this basic parameter in mind Mansukhbhai came up with Mitticool, a fridge made of clay. It works on the principle of evaporation.
Biotech India Biogas Plants
Turn household wastes (human wastes and food scraps) into clean burning biogas with $300-$400? (waiting for current price list) Biotech biogas plants, or make one yourself. Biotech also sells waste to electricity plants. Payback period is only 2-3 years. They now mass produce their biogas plants out of PVC and aim to sell one to every household in India as a standard commodity.