Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Support PBS Shop PBS Search PBS
Episode 1
About Search Time Tree Ring Lab Resources Home
Searching Through Time - Timeline
How are scientists able to look back at climatic changes from times as long as thousands of years ago? Click on the Images below to learn about several of the techniques used as well as how the methods can help corroborate each others evidence.

Ice Cores Tree Rings Carbon-14 Dating Putting It All Together