Photo via Cleantechnica

While we’ve received a healthy influx of signs that the world’s heavyweights aren’t planning on diversifying their energy portfolios to any radical degree in the near future — China building a submersible to dive 7,000 meters underwater to explore for oil among them — there are still reasons yet to be optimistic. Take this for example: the CEO of the largest mining company in the world, Australia’s BHP, ha…Read the full story on TreeHugger