The final session I attended was inside the Minnesota Planetarium Exploradome! This portable dome which seats 25-30 students can be brought to your school for grade appropriate sessions of 25-50 minutes in length. Along with all of the typical planetarium type capabilities, you can also teleconference with scientists to explore issues on earth. In the session I attended, we were in communication with a scientist from NASA, who demonstrated the capabilities of taking data from the NASA Web site, and "wrapping" the Earth with the images in real time. This allowed us to explore carbon emissions as well as ocean surface temperature. The site has data on Oceans, Atmosphere, Energy, Land, and Life.
A really cool feature of this data was the ability to import it into Google Earth! The site is called NASA Earth Observations.
You can learn more about the Exploradome here.