According to Lenton and his colleagues, oxygen levels increased once more before falling to present day levels.

据莱顿和他们的同事们表示，氧气在返回今天的水平之前也曾再次增长过。

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However, Dr Lenton notes that the method becomes less effective as the atmosphere becomes more saturated with particles.

但是，Lenton博士指出，随着喷向大气中微粒的逐渐饱和，这一做法的效果将逐渐减弱。

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"Overall, too much variety may mean, as suggested by our findings, that people put off making a decision," Lenton said.

“我们的发现表明，总的说来，种类太多可能意味着人们会推迟做决定，”莱顿说。

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Timothy Lenton, a climate scientist at the University of Exeter, argues that such pollution could trigger wider instability in the monsoon.

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The Gang Avoidance Project in Lenton gives out advice followed up by workshops in which parents and children are encouraged to talk to each other and the police, project bosses said.

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Similarly sobering conclusions are reached in the second paper, by Tim Lenton of the University of East Anglia and Naomi Vaughan of the Tyndall Centre for Climate Change Research, and published in Atmospheric Chemistry and Physics Discussions.

ECONOMIST: Geo-engineering