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Obama optimistic about climate change efforts

He also pledges support to island nations whose existence is threatened by climate change

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Mr Obama has put aside one policy he said made sense: a carbon tax. Many countries - including Germany and Japan - support such a tax because it would alter incentives and could provide a steady stream of revenue to fund other investments or renewable technologies.

Paris

US PRESIDENT Obama declared himself hopeful about the prospects of slowing climate change on Tuesday, even as he acknowledged that the actions emerging from the United Nations climate summit here would fall short of the desired international targets.

"I'm optimistic. I think