This website offers NASA's Earth Observatory newest feature -- an educational module about global warming. Beginning with a recap of the tremendous heat wave that struck Europe in the summer of 2003, the website proceeds with an educational discussion about the interaction between water vapor and other greenhouse gases and the atmosphere. Users can learn about climatic modeling and some assumptions that are incorporated into these models. Students can find out how NASA scientists utilize satellite and other data to validate their climate models. The website also features a lengthy discussion about humidity and its affects on weather.