|Occupy Wall Street had the aforementioned greywater treatment system and bike generators in NYC built by Time's Up. In October, Greenpeace brought solar panels to the site (video at http://www.youtube.com/watch?v... ). There was even a system for carrying compostable "wastes" to community gardens by cargo bike.
In Boston, Revolt Lab designed and built a portable solar charger (more at http://www.tgdaily.com/sustain... ). Sage Radachowsky built a winterized micro house and brought it to the Occupation.
There is even an effort to Occupy Rooftops on Community Solar Day, November 20, by Solar Mosaic, a group which has been building community solar projects one panel at a time.
All of these are great ideas and a good start but there are many other things that are possible.
How about the 99% expressing solidarity with the Other 90%, the poorest people around the world, by using the solar cooking techniques that has been used in African refugee camps for years:
[embed didn't seem to work for me]
I especially like this video because it not only shows you how to use (and make) a simple solar cooker but also demonstrates an old slow cooking technique, the hotbox or haybox cooker. This is simply an insulated container into which is placed the a pot of food once it has been heated up to cooking temperature. This is an idea that goes back a long ways into our history and is just as useful today.
Rainwater harvesting is another simple idea that the Occupations could use as access to water has been an issue for most Occupation sites since they started.
Sanitation is an obvious problem that has not been adequately addressed. I wonder if the Drink Pee Drink Pee Drink Pee process where you can pee in a container and "then perform a biochemical reaction that transforms the nutrients in your urine into an immediately usable fertilizer to feed your own plants" might be applicable.
The US military is now making solar and wind powered forward bases. Can some of their technology be adapted by the Occupations? Does Architecture for Humanity and Crisis Commons have any interest in trying out emergency response ideas through the Occupations?
These ideas are only a beginning of what is possible.
All I know about simple solar is at
Trash Technology and Recycled Solar: Plastic Bottles