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Science Nation: Lord Of The Tree Rings

2 minutes 30 seconds

Now Playing As: Captioned (English) (change)

David Stahle travels to ancient forests around the world, collecting tree rings to learn more about major climate and historical events dating back hundreds and thousands of years. With help from the National Science Foundation, he uses dendrochronology, or tree-ring dating, to get a snapshot of climate change over time. Stahle runs the Tree-ring Lab at the University of Arkansas, where he and fellow tree-ring researchers are learning that a trend of global warming began in the 1800s and continues today, brought about by changes in tropical sea surface temperatures of no more than a few tenths of a degree Celsius. Today Stahle is working with hydrologists and government planners in California and throughout Mexico to plan for drought and climate change events.

Media Details

Runtime: 2 minutes 30 seconds

Topic: Science
Subtopic: Conservation, Environmental Issues, Plants, Weather
Grade/Interest Level: 7 - 12
Standards:

Release Year: 2009
Producer/Distributor: National Science Foundation
Series: Science Nation
Report a Problem

Computer screens with color-shaded images of a spiral shaped storm. Caption: study hurricanes, tornadoes, and blizzards from the inside.

Person filling a glass from a faucet. Caption: our risk of contracting some form of cancer would go up.

Green landscape with a hillside in the background. A small industrial installation is present. Caption: They don't know where to get information they can trust.

Robotic arms manipulating a small ball. Caption: is pushing the world of robotics and prosthetics

Bolt of lightning arcing from cloud to ground. Caption: we all want up-to-the-minute information.

Cluster of nerve fibers. Caption: that can image deep into biological tissue,

Dirty water with bubbles and PVC pipes. Caption: and reused again and again in a sustainable loop.

Person with a fabric cap strapped to their head. The cap has metal rivets and wires attached. Captions: (female) it feels maybe like a mild itchy or tingling sensation.

Microscopic image showing web-like structures and C shaped tubular organisms. Caption: (narrator) The soil itself is home to a vast number of tiny microbes,

White glowing orb against a black grid. Caption: Weakly Interacting Massive Particle