PETA is demanding to know: Why won’t Al Gore’s climate change music festival go vegan? On stage at Davos this year, Gore and Pharrell Williams announced the return of the Live Earth music festival — a concert series meant to raise awareness of climate change. And now the animal rights group is demanding each of the concerts exclusively serve vegan products, arguing that Gore’s own group touts the benefits of giving up meat to reduce greenhouse gas production. In a series of emails obtained by BuzzFeed News, representatives from PETA repeatedly ask Live Earth’s organizers if they plan to serve...