A couple of months ago, I was telling you about a free download of David Nicholson-Cole’s “GDL Cookbook 3″ and saying how I was looking forward to the updated version. Well it’s out and it’s a free download as well. You can get it either as a single concatenated file or as 48 individual chapters. [...]

Found this article at Sustainable Design Update about Sintex Industries making a prefabricated biogas digester which turns waste and garbage into cooking fuel. Nothing new about the technology but constructing a tank has always been the biggest headache. Now, you can just get it ready-made and install it. According to this Fortune magazine article, it [...]