Ban Ki-moon, the normally buttoned-up Secretary General of the United Nations, swept into Los Angeles during Oscar week playing the role of Hollywood pitchman. His message: Make global warming a Hot issue. "I need your support," he told entertainment industry insiders during a daylong forum Tuesday that focused on recent heat waves, floods, fires and drought, which scientists link to human-induced climate change. ....about 400 writers, directors, producers, agents and network executives attended the outreach events. ....To coordinate with Hollywood, the U.N. has set up an office, the "Creative Community Outreach Initiative" in partnership with the United Nations Foundation, funded...