The concept of the 'Anthropocene' has gained traction among geologists as a proposed new geological epoch defined by significant human impact on Earth's geology and ecosystems. Unlike previous epochs, which were characterized by natural climatic shifts or biological events, the Anthropocene is marked by human-induced changes such as nuclear fallout, plastic pollution, and accelerated species extinction. However, the formal recognition of this epoch remains contentious. Critics argue that human impacts are not synchronous globally, with different regions experiencing changes at different times, making a single global boundary difficult to establish. Proponents counter that markers like the radioactive isotopes from mid-20th-century nuclear tests provide a clear, worldwide signal. This debate highlights a deeper issue: whether geological classification should prioritize measurable physical evidence or acknowledge the unprecedented scale of human agency in shaping planetary processes.
❓ 根据文章所述，一些科学家反对正式承认“人类世”为地质纪元的主要原因是什么？
A. 人类活动对全球的影响并不均匀分布，这使得确定一个单一的起始日期变得复杂。
B. B) 用于界定该时代的标志物，如核沉降物，并非在所有地区都能检测到。
C. C) 这一概念过度强调人类能动性，而忽视了自然过程。
D. D) 所提出的纪元缺乏足够的物理证据来支持其存在。
✅ 正确答案
A) Human impacts are not evenly distributed across the globe, complicating the identification of a single start date.