This website offers a wide variety of information on the issue of climate change in the US. It gives info on how it effects our environment, how one tests the climate, and more. It has a map which has facts on the state of our climate in our area. All in all, it is a great site for information.

Wikipedia gave great information which is both interesting and helpful in the current unit.

This website did have interesting facts but the time period it was informing us about was before the time that is featured in the Ancient Denver book. The class isn't doing this section either.