Chinese President Hu Jintao addresses the opening ceremony of the United Nations Climate Change Summit at the UN headquarters in New York Sept. 22, 2009.
UN Secretary-General Ban Ki-moon expressed appreciation to China's new proposal. "I think that anyone who still doubts their sincerity on climate change needs to take another look. China realizes the impact that climate change has and that they must act," Ban said.
In his address, Hu said China will intensify effort to conserve energy and improve energy efficiency, and endeavor to cut carbon dioxide emissions per unit of gross domestic product (GDP) by a "notable margin" by 2020 from the 2005 level.
Former U.S. vice president and environmental activist Al Gore praised on Tuesday China's efforts the country has devoted to tackle climate change.
"It's not widely known in the rest of the world but China in each of the last two years has planted two and half times more trees than the entire rest of the world put together," he noted.
He believed Hu's remarks could point to more actions.
The Chinese president said at the summit that China will adopt to further integrate actions on climate change into its economic and social development plan.
Current President of the UN General Assembly Ali Treki on Tuesday said Hu's remarks were of great importance to global efforts on climate change and to the success of the Copenhagen Conference.