Tens of thousands of people joined one of the biggest global days of climate change activism on Sunday, from Sydney to Berlin, to put pressure on world leaders to unite in fighting global warming at a summit in Paris. About 20,000 pairs of shoes were laid out in the Place de la Republique in the French capital, from high-heels to boots, to symbolize absent marchers after attacks by Islamic State militants killed 130 people on Nov. 13 and led France to ban a protest that was meant to be at the heart of the global action. Organizers said the Vatican sent a pair of shoes on behalf of Pope Francis. One activist, dressed in white as an angel with large wings, held a sign saying "coal kills". http://english.ahram.org.eg/News/172075.aspx