For Ban Ki-moon, bringing about a new U.N. climate treaty by the end of this year is a must.

Ban decided from the moment he became U.N. secretary-general in January 2007 that “climate change should be the most important top-priority issue for the United Nations, for the entire world,” he said in an Associated Press interview this week.

Since then Ban says he has put “all my efforts and energy” into persuading nations to cut a new climate deal in Copenhagen, Denmark, in December, replacing the Kyoto Protocol for reducing greenhouse gases that expires in 2012.

“From day one, I have been trying to visit all the places around the world, wherever and whenever I was able to see the consequences of climate change,” he said. “Now, the United Nations is leading this campaign, in close coordination with the … major players.”

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