World leaders, high security at Paris climate summit

More than 50 world leaders are joining bankers, energy magnates and others Tuesday in Paris for a summit that President Emmanuel Macron hopes will give new momentum to the fight against global warming — despite U.S. President Donald Trump's rejection of the Paris climate accord.Sean Penn, Arnold Schwarzenegger, Bill Gates and Elon Musk are among prominent figures joining the world leaders at the summit, where participants are expected to announce billions of dollars' worth of projects to h