PBS
Pbs Learning Media: What's Up With the Weather: Graphs
Examine this graph from FRONTLINE/NOVA: "What's Up with the Weather?" Web site to see dramatic increases in three greenhouse gases over the last two hundred years.
University of California
University of California Museum of Paleontology: Uniformitarianism
Read about the pioneers in Earth's geologic history and their discovery of how the process of uniformitarianism shaped the study of evolution.