Obama urges world leaders to tackle climate change President Barack Obama has urged world leaders to make concerted efforts in tackling climate change, saying American efforts to cut greenhouse gas pollution alone cannot accomplish the goal. Mr. Obama said this in his address at the Climate Summit at the UN Headquarters. Mr. Obama emphasized the importance of taking "ambitious" actions, calling for the world's leading economies to move past fears that tackling climate change could hurt growth. UN Secretary General Ban Ki-moon called for global action to address climate change. He said it threatens hard-won peace, prosperity, and opportunity for billions of people. Climate Change Ambassador,Leonado di Caprio asked world leaders to insulate climate issues from politics. He said the phenomenon is no respector of persons. Another Climate Ambassador,Lee Bing Bing couldn’t agree more with the earlier speakers. She noted that climate change issues must be a concern to all. GBC