The Global Hawk, an unmanned aerial vehicle that's seen action in Iraq and Afghanistan, is now being used to study the environment.
Earlier this year I wrote a story on the Global Hawk's new mission for Unmanned Systems, the magazine of the Association for Unmanned Vehicle Systems International. I traveled to Edwards Air Force Base for the unveiling of the aircraft and interviewed the program scientists and engineers. It's a fascinating science-based project using a drone that can stay aloft for 30 hours, allowing it to travel from the equator to the polar regions and back in one flight.
It's a members-only magazine so the online content is restricted to subscribers, but NASA liked the article so much they asked to make it available at their website. You can download a 4.6 MB PDF of my story here (the photos are mine as well).