Human activities are causing massive increases in extinction rates but might also lead to drastic increases in speciation rates; for example, after human-mediated spread of species to otherwise unreachable landmasses. The long-term net anthropogenic effects on biodiversity therefore remain uncertain. Our aim was to assess the combined anthropogenic effects of extinctions and speciations on biodiversity over geological time-scales.

中文翻译：

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人为物种形成和灭绝对哺乳动物物种丰富度和系统发育多样性的抵消作用

人类活动正在导致灭绝率大幅上升，但也可能导致物种形成率急剧上升；例如，在人类介导的物种传播到其他无法到达的陆地之后。因此，对生物多样性的长期净人为影响仍然不确定。我们的目的是评估灭绝和物种形成在地质时间尺度上对生物多样性的综合人为影响。