As he hugs a tree, Dave Anderson speaks into a camera. "I'll only hug New Hampshire's very own sugar maple," he says. He warns that if climate change persists, the sugar maple will no longer grow in New Hampshire.

Peter Britz, environmental planner for the city of Portsmouth, urges people to think of three things a day to do differently, such as hanging clothes on a line to dry.

Randy Ryan, president of ConVerdant Vehicles in Concord, talks about an impending world-wide transformation "from carbon-based energy to anything-but-carbon-based energy."

Welcome to a unique mix of technology and political activism. The environmental group Repower New Hampshire has joined the national effort to create the "Repower Wall." The online wall is actually a mix of more than 12,000 YouTube videos created by environmental activists around the country, urging support for legislation and other actions to solve the problem of climate change. Companies from The Gap to Starbucks to eBay have joined the effort, according to Repower New Hampshire, along with numerous Granite Staters.

To join, visit repoweramerica.org/wall.

SHIRA SCHOENBERG