Agence France-Presse: Nobel laureate and former US vice president Al Gore on Thursday urged Americans to shoot for the moon and make a total shift from fossil fuels to renewable energy to avert a global crisis sparked by climate change. “I challenge our nation to commit to producing 100 percent of our electricity from renewable energy and truly clean carbon-free sources within 10 years,” Gore told thousands of people who packed into a conference hall near the White House to hear the 2007 Nobel …