The concept of the 'Anthropocene' has gained significant traction in geological and environmental circles, proposing that human activity has become a dominant force shaping the Earth's systems. Unlike previous geological epochs, which were defined by natural phenomena such as ice ages or asteroid impacts, the Anthropocene is characterized by markers like plastic pollution, nuclear fallout, and a dramatic spike in carbon dioxide levels. However, the formal recognition of this epoch remains contentious. Some scientists argue that the changes are too recent and not yet fully stratified in the geological record, while others contend that the scale and irreversibility of human impact warrant a distinct epoch. This debate underscores a deeper question: whether human influence has truly pushed the planet into a new geological reality, or whether we are merely witnessing an accelerated phase of a longer natural cycle.
❓ 根据文章所述，围绕正式承认“人类世”引发争议的主要原因是什么？
A. A. 人类世的标志，如塑料污染，并未被普遍认为具有重大意义。
B. B. 一些专家怀疑，人类引起的变化是否足够近期，并且在地质层中是否有清晰的记录。
C. C. “人类世”的概念与冰河时期等自然地质时代的观念相冲突。
D. D. 没有证据表明人类活动已在全球范围内改变了二氧化碳水平。
✅ 正确答案
B. Some experts doubt that human-induced changes are sufficiently recent and clearly recorded in geological layers.