(Undated)  --  Police in Australia are investigating the death of award-winning environmental photographer Gary Braasch.  The 70-year-old climate change campaigner from Portland, Oregon died yesterday while snorkeling at the northern end of the Great Barrier Reef.  Braasch was documenting the effect of climate change on the reef.  The Great Barrier Reef is the world's largest living ecosystem, stretching 12-hundred miles off the northeast coast of Australia.