population competing for ever scarcer resources could make for an "unrecognizable" world by 2050, researchers warned at a major US science conference Sunday.

上周日，研究人员在一个大型美国科学会议上警告说，随着地球人口越来越多，越来越富，人们对匮乏资源的争夺可能会导致地球到2050年变得“面目全非”。

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A competing theory is that a mutagenesis drug may eradicate a virus or bacterial population by reducing the fitness to negative values.

一个竞争性的理论是诱变药物通过降低对负面价值的适应性而根除病毒或细菌群体。

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The future that this child and its generation will inherit depends to a great degree on how we handle the competing pressures of growing population growth, urbanization and climate change.

这个孩子及其所属世代将要承继的未来，在很大程度上取决于我们如何处理持续的人口增长、城市化和气候变化竞相造成的压力。

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"Even with the broadening population and wide range of competing activities, mobile owners are drawn to news on their tablet and smartphones, " said PEJ deputy director Amy Mitchell.

ENGADGET: Pew Research finds 22 percent of adults in US own tablets, low-cost Android on the rise