Others argue that climate change was more to blame, leaving a species adapted for frozen climes ill-equipped to cope with a warming world.

其他专家认为气候变化是主因，气候变化造成适应冰冻气候的物种无法很好的应对变暖的环境。

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For the research on shift-working suggests that human beings are ill-adapted to working at night, says Simon Folkard, who studies shift-work from the University of Wales in Swansea.

ECONOMIST: No more nine-to-five