Hi Bryan,
very good article. I'm from europe and currently researching the theme "environmental impact of skydiving" as we will probably face much more critics on that in the near future - so I try to be prepared with facts.
one remark: the Exxon Valdez spill etc example is misleading: spilled oil is in terms of "climate change" neutral - its still in its bound form and for the air its the same if IN the earth or ON the earth (of course ignoring the other problems of oil spill).
thanks for your comprehensive overview.
Andreas
