I recently discovered the work of Edward Burtynsky. It is very intriguing and a great example of what is possible when you do what you are passionate about. Clearly Edward is a great photographer, but the theme of his work conveys a very powerful message of the human footprint on the Earth.
This is an amazing video created using some fancy technology and math. In any event, it's pretty cool. The world loves it's photos. If you look closely you can see me bouncing all over the country last year.
Below is a still shot of the United States celebrating the 4th of July.