This should make Mother Nature happy. The environmentally minded former VP joined singer Pharrell Williams in Davos yesterday to announce a potentially historic climate-change campaign. Reviving the original 2007 concept, Live Earth 2015 will take place on June 18, featuring more than 100 artists and performances on every continent. They hope to attract a global audience of 2 billion viewers and collect signatures encouraging world leaders to approve a new climate accord. Clap along if you feel like eco-activism is the truth.