The Climate Timeline Web site was developed at the National Geophysical Data Center at NOAA's Boulder Laboratory and was designed as an online tool that allows users to examine climate change and variability at different time scales throughout history. The site allows visitors to explore climate history and science from today to over 100,000 years ago through descriptions, illustrations, and other attractive graphics. An interesting and distinctive approach to climate history, this site will appeal to anyone interested in climate, weather, or earth history.