Contributor(s): Thomas L Friedman | Thomas L Friedman takes a fresh and provocative look at two of our biggest challenges - the global environmental crisis and America's surprising loss of focus and national purpose since 9/11 - and shows how they're linked. He argues that we need American commitment and leadership in a green revolution, a revolution that will be the biggest innovation project in history, one that will inspire us to summon all the intelligence, creativity, boldness and concern for the common good that are our greatest human resources.