has produced and posted online a stunning 30-minute video about Canadian tar sand mining.

They describe it as "The first original production by and for Babelgum, 'Downstream' focuses on the controversy surrounding the development of Alberta's oil sands. This beautifully photographed documentary is an eye-opening investigation into one of the world's most polluting oil operations. It includes interviews with ecologists, Canadian politicians, local residents and a very dedicated doctor, discussing the environmental, economic and health issues surrounding the oil sands development.."

This follows a 20-page story by National Geographic about what has been called "the most destructive project on Earth".

As National Geographic said. "this may be the clubbing the baby-seal moment" for the tar sands industry.