A balloon with "This is the size of one tonne CO2" written on it is seen in Copenhagen, capital of Denmark, Dec. 9, 2009, on the occasion of the United Nations Climate Change Conference.
A balloon with "This is the size of one tonne CO2" written on it is seen in Copenhagen, capital of Denmark, Dec. 9, 2009, on the occasion of the United Nations Climate Change Conference.
(Xinhua/Lin Miao)
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