她补充说,一个最大的担忧是地球上是否有足够的资源来满足人们的基本需求。人口增长加之气候变化可能会给农业生产和获取清洁饮用水带来更多困难。
"These are all big things," Snover said. "We don't have the luxury of picking only one problem to focus on because they're all coming and they're all coming together."
斯诺弗说:“这些都很重要。我们不能只关注一个问题,因为这些问题都出现了,而且是一起出现。”
Scientists say it's difficult to know whether there's a limit to the number of people the planet can sustain — or when we could be approaching it. Still, according to Bradshaw, the 7.7 billion people who inhabit Earth now may already be pushing the planet to a breaking point.
科学家表示,很难知道地球能承受的人口上限,或者何时会接近上限。不过,据布拉德肖说,现在居住在地球上的77亿人可能已经把地球推向了崩溃的边缘。
"Even if we maintained the current status quo and not a single other carbon molecule was released because of human activity," he said, "we'd still see the effects of climate change for at least 300 years from just the emissions that are already in the system."
他说:“即使我们维持目前的现状,不再因为人类活动而有更多的碳排放,但由于生态系统中已经存在的碳排放,在未来300年内,我们仍然可以看到气候变化的影响。”
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