The most unappealing outcomes would arise if extraterrestrials caused harm to humanity, even if by accident.

如果外星人对人类使坏，即便是偶然地，最不理想的结果可能会出现。

youdao

Gerardo and Mercedes share the commitment to teach this Calendar now, during this critical time of change when Mother Earth is cleansing from the damage humanity has caused.

在这个转变的危急时期，地球母亲正在清洁人类的破坏，杰勒德和默西迪丝现在承担义务去教导这种历法。

youdao

The clock setting, which has been a staple since 1947, represents the severity of the perceived threat to humanity from nuclear or biological weapons, climate change and other human-caused disasters.

“末日之钟”于1947年设立，代表了人类感受到的来自核武器或生化武器、气候变化及其它人为灾难等威胁的严峻程度。

youdao

"If you look back historically at what has caused humanity to make its largest investments in exploration and in transportation, it has been going after resources, whether it's the Europeans going after the spice routes or the American settlers looking toward the west for gold, oil, timber or land, " Mr Diamandis explained.

BBC: Plans for asteroid mining emerge