[2] In 2007, when he was a science teacher at Central High School in Independence, Oregon, Craven posted the nine and one-half minute The Most Terrifying Video You'll Ever See[3] on YouTube.
The video presented a simplified version of risk management using a 2x2 grid to sketch out possible scenarios based on: a) whether we choose to take action or not, and b) whether global warming turns out to be a threat or not.
In the first six months online it garnered four million hits, and prompted Craven to spend six weeks creating 44 follow up videos totaling over seven hours detailing specifics of risk management applied to climate change.
"[5] Craven was the focus of some media attention,[6] was named "Featured Teacher" by WIRED Science,[7] and was opposed by climate change denialists.
'"[10] This prompted Craven to publish a clarification taking personal responsibility and emphasizing that his remarks were in no way associated with the AGU organization or its official view.