The Park Spark project is based around introducing a Methane Digester into Public Parks to collected dog waste and transform it into Methane. Here the Methane produced by the Digester is being burned in the form of a lamppost for light.
Methane Digestion is a very simple yet completely mystifying technology. It gets even more interesting when you learn that burning its product (methane) is good for the environment and can actually earn you carbon.