Whatever the answer, it seems like any century vying for that top spot is at a moment of great change — when the actions of our ancestors shifted humanity's trajectory for centuries to come.

无论答案如何，似乎任何一个争夺这个位置的世纪都身处巨变之中——我们祖先的行为改变了人类未来几个世纪的轨迹。