New York, Dhu-AlQa'dah 28, 1435, Sep 23, 2014, SPA -- UN Secretary General Ban Ki-moon opened the UN Climate Summit on Tuesday, as world leaders and several business executives gathered to announce their commitments to reduce the effects of climate change. "Climate change threatens hard-won peace, prosperity and opportunity for billions of people," Ban said. "Today we must set the world on a new course." The UN chief called on governments and private institutions to invest in climate solutions designed to reduce the emission of greenhouse gases, dpa reported. --SPA 18:53 LOCAL TIME 15:53 GMT www.spa.gov.sa/w