'No Planet B', marchers worldwide tell leaders before U.N. climate summit

By Megan Rowling and Morag MacKinnon PARIS/PERTH, Australia (Reuters) - Hundreds of thousands of people from Australia to Paraguay joined the biggest day of climate change activism in history on Sunday, telling world leaders gathering for a summit in Paris there is "No Planet B" in the fight against global warming. Among the high heels and sandals were a pair of plain black shoes sent by Pope Francis, who has been a vocal advocate for action to prevent dangerous climate change, and jogging shoes