雅思阅读

📖 Reading Passage

The concept of the 'Anthropocene' has gained significant traction in geological and environmental circles, though it remains formally unrecognized as a distinct epoch. Proponents argue that human activities, particularly since the mid-20th century, have left indelible marks on the planet's stratigraphy, including radioactive isotopes from nuclear tests, microplastics, and elevated carbon dioxide levels. These markers, they contend, are as distinctive as those that define previous geological boundaries. However, critics within the geological community caution that the term conflates human impact with a formal time unit, which typically requires a global, synchronous signal in rock layers. They suggest that while human influence is undeniable, its stratigraphic signature may be diachronous, appearing at different times in different regions, thus complicating its use as a precise chronological boundary. This debate underscores a deeper tension between scientific classification and the broader societal narrative of human stewardship over Earth's systems.