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A rural teacher with global reach

Greg Craven of Monmouth, Ore., shot a low-tech video on climate change that is attracting a major online audience.

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Greg Craven is flat out. The fifth-period physics class he teaches is about to start, and there's still lesson planning to do. But at his cluttered desk over by the window, he's e-mailing last-minute changes to his guest column scheduled to run tomorrow in The Oregonian newspaper. And a producer from National Public Radio in New York has called about setting up an interview.

You could say this all illustrates chaos theory, he observes – searching for underlying order in things that seem random. Which relates to global climate change, as Earth heats up from a multitude of causes. Which relates to why this young high school science teacher in rural Oregon is juggling so many things on a wintery gray afternoon at Central High School here in Monmouth.

It all started last spring. Mr. Craven posted a nine-minute, 33-second clip on YouTube, the video-sharing website featuring everything from "stupid pet tricks" to presidential candidates pandering to voters.

Called "The Most Terrifying Video You'll Ever See," it attempted to explain the reality and risk of what he says is "likely to be the greatest threat that humanity has ever faced."

The video is low-tech – just a guy in a purple T-shirt standing at a whiteboard drawing a simple diagram to illustrate his point: The best available science shows us headed toward a global-warming disaster unless we take urgent steps to prevent it.

Craven also produced a follow-up YouTube clip, which takes into account criticisms he received, called "How It All Ends." Together the videos have "gone viral." They've rocketed around the Internet, spawning postings elsewhere and the creation of special websites by those impressed with his work. So far, the videos have attracted more than 4 million views, a query from a book agent, and a call this week from ABC's "Good Morning America" TV show.

The work also has received kudos from experts who've seen it.

"It's amusing, and transmits the idea of risk management very effectively," says Michael Oppenheimer, professor of geosciences at Princeton University in New Jersey and a lead author of this year's reports by the United Nations' Intergovernmental Panel on Climate Change (IPCC). "About two-thirds of the way through, he takes off his neutral cap and decides to advocate for the 'let's act' side," Dr. Oppenheimer says. "After that, the pitch is a little more traditional, but no less effective."

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