对智慧生命演化“艰难步骤”模型的重新评估
A reassessment of the "hard-steps" model for the evolution of intelligent life
AI总结：
本文结合地球与生命科学进展重新审视“艰难步骤”模型，提出以全球宜居窗口相继开启和生命—环境协同演化解释人类出现时机的替代框架。
摘要：
根据“艰难步骤”模型，人类的起源需要“成功通过若干中间步骤”（即所谓“艰难”或“关键”步骤），而相对于地球上生物演化可利用的总时间而言，这些步骤本质上是小概率的。该模型同样预测，宇宙中与地球人类相似的技术生命“极其罕见”。本文结合地球科学和生命科学的最新进展，批判性地重新评估艰难步骤模型的核心假设。具体而言，我们提出一种可能的替代模型：其中不存在艰难步骤，人类起源所需的演化新事物（或奇点）可以通过内在小概率性之外的机制来解释。此外，如果地球表层环境最初不仅不适宜人类生存，而且也不适宜人类演化中某些关键中间步骤（例如真核细胞的起源、多细胞动物的起源），那么人类出现的“延迟”最好通过地球历史上新的全球宜居环境窗口的相继打开来解释；一旦适当条件建立，人类便相对迅速地出现。在这种协同演化（或称地球生物学）情景中，相对于生物圈的整个寿命，人类并非演化得“过早”或“过晚”，而是“准时”出现。
英文摘要：
According to the "hard-steps" model, the origin of humanity required "successful passage through a number of intermediate steps" (so-called "hard" or "critical" steps) that were intrinsically improbable with respect to the total time available for biological evolution on Earth. This model similarly predicts that technological life analogous to human life on Earth is "exceedingly rare" in the universe. Here, we critically reevaluate the core assumptions of the hard-steps model in light of recent advances in the Earth and life sciences. Specifically, we advance a potential alternative model where there are no hard steps, and evolutionary novelties (or singularities) required for human origins can be explained via mechanisms outside of intrinsic improbability. Furthermore, if Earth's surface environment was initially inhospitable not only to human life, but also to certain key intermediate steps in human evolution (e.g., the origin of eukaryotic cells, multicellular animals), then the "delay" in the appearance of humans can be best explained through the sequential opening of new global environmental windows of habitability over Earth history, with humanity arising relatively quickly once the right conditions were established. In this co-evolutionary (or geobiological) scenario, humans did not evolve "early" or "late" with respect to the total lifespan of the biosphere, but "on time."
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
