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阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

The most effective way 1.(fight) global warming is to plant lots of trees, a study has said. And there is enough space for new trees to cover 3.5 million square miles, Swiss 2.(scientist) reported in Science. That area is roughly the size 3.the United States.

The study calculated that over the decades, those new trees could suck up nearly 830 billion tons of heat-trapping carbon dioxide (CO2) from the atmosphere. That’s about as much carbon pollution 4.humans have caused in the past 25 years.

Six nations with the most room for new trees 5.(be) Russia, the United States, Canada, Australia, Brazil and China.

Study co-author Thomas Crowther 6.(figure) that there were other more effective ways besides 7.(cut) emissions ( 排放物 ), such as people switching from meat-eating to vegetarianism. But, he said, tree planting was by far the cheapest climate change solution.

Thomas Lovejoy, a George Mason University conservation biologist, called it “a good news story” because planting trees would also help promote the 8.(protect) of biodiversity.

“It is not easy or realistic to think the world will suddenly start planting trees everywhere, although many groups have started,” Crowther said. “It’s 9.(certain) a monumental challenge, 10. is exactly what people are saying about the problem of climate change.”

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