I've been learning d20 Modern and more specifically d20 Future in the hopes of getting a campaign going. Came across a recent article that ties neatly into the framework provided in Chapter 4: Environment from the d20 Future hardcover. So for those who are interested:
The pdf version looks better; link off to right side of html version.
A future article will look at the physiologic effects of space flight. If there is interest, I will post when it becomes available.