34 35th St., Unit 26, Brooklyn, NY, 11232
Mapping the gulf oil spill with balloons and kites: http://grassrootsmapping.org/gulf-oil-spill/
This is a very different kind of crowdsourcing to raise awareness of the impact of the extraction industry on U.S. citizens. They're keeping the maps of documentation in the public domain, so there will be a vivid public record, and provide a guide for creating these sorts of weather balloons yourself!
Kind of reminds me of some graffiti I saw in Endicott, NY (near Binghamton):
IBM CHEMICAL SPILL HERE -->