Tree rings tell the tale
| Climate on Earth is never constant. For billions of years, natural forces affected the planet's climate. Now humans are affecting climate with the burning of fossil fuels. What was Earth's climate like in ancient times? One way we can learn more about past climate is by studying tree rings. We look at scientists coring the trunks of ancient pine trees in Siberia. By studying the pattern of annual growth rings in trees, they can better understand how ancient climate affected a single region or the world. |
Credit: "Our Changing Planet", Upper Midwest Aerospace Consortium
For more info: http://www.umac.org/ocp/tales/