Huffington Post: Last year a friend of mine and her husband set out with their three children on a trek from Missouri to the boreal forests of central Canada to raise awareness about climate change. She read Bill McKibben's article "Global Warming's Terrifying New Math" and, just like that, dropped everything to walk a thousand miles with her family accompanied only by their home-built "Conestoga" wagon.
Here's the thing: My friend is NOT insane. She digested McKibben's measured words, backed by the painstaking...