Plenty of people remarked on Al Gore�s comment, in my Thursday column, encouraging young people to engage in peaceful protests to block new carbon sources. Specifically, he said he was stunned that people weren�t blocking bulldozers constructing new coal-fired power plants.

There is, in fact, an effort to build more of a protest movement around climate change. Bill McKibben, an old college classmate whom I met when we both tried out for the Harvard Crimson in September of our freshman year, has become a leader in the effort to curb greenhouse gases. Bill worked about 100 hours a week on the Crimson and is now directing his vast energy to mixing journalism and activism to keep the sea level where it is. Bill has started a new website, www.stepitup2007.org, focused on the effort to galvanize a climate protest movement. Check it out.