Screaming Penguin - Source Does Matter

New software from NASA:

NASA FREE COMPUTER MODEL AVAILABLE TO CLASSROOMS

A free NASA global climate model is available for high school and university desktop computers.

The Educational Global Climate Model (EdGCM), available for both Windows and Mac platforms, incorporates a 3-D climate model developed at NASA’s Goddard Institute for Space Studies (GISS), New York. It wraps complex computer modeling programs with a graphical interface familiar to most PC users.

The climate model runs on a desktop computer to allow teachers and students to conduct experiments identical to those scientists run on supercomputers to simulate past and future climate changes. EdGCM links the climate model to both a database and scientific visualization utilities, making it simpler to create and organize data and images.

Now the kids can play with the REALLY big boys.
  NASA News