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Against the fact that the global climate is being warmed rapidly by human-produced greenhouse gases, scientists warned on Tuesday that the situation of climate change in the future has reached a point of extreme gravity.

Global warming will become irreversible if countries are still reluctant to take action now, some high-profile scientists told the China-U.S. Climate Change Forum at the University of California, Berkeley (UC Berkeley).

Inez Fung, a meteorologist and professor at the university, said human activities had destroyed the natural cycle of the earth's carbon dioxide (CO2), leading to an accumulation of major greenhouse gases.

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