UN Secretary General Ban Ki-moon (L) and Japanese Foreign Minister Hirofumi Nakasone in Tokyo on June 30, 2009. Ban Ki-moon has called for Japanese companies to help fight global warming through green investment and ambitious emission cut targets, a business lobby has said.(AFP/File/Kazuhiro Nogi)AFP - UN Secretary General Ban Ki-moon has called for Japanese companies to help fight global warming through green investment and ambitious emission cut targets, a business lobby said.