Question

Passage A

Historically, geological epochs have been defined by major, naturally occurring transitions in the Earth's rock layers, such as shifts in fossil assemblages, massive volcanic events, or significant climatic cycles. However, a growing body of geologists argues that human activity has now left an indelible, globally synchronous mark on the stratigraphic record, justifying the formal definition of a new epoch: the Anthropocene. Proponents of this formal designation point to the mid-twentieth century—specifically the onset of the "Great Acceleration" around 1950—as the most scientifically defensible starting point. It was during this period that the widespread testing of thermonuclear weapons released artificial radionuclides, such as carbon-14 and plutonium-239, which settled into soils and marine sediments worldwide, creating a permanent and easily identifiable marker in the rock record. Furthermore, the exponential surge in industrial production, synthetic plastic consumption, fertilizer runoff, and greenhouse gas emissions during this post-World War II era has altered sediment composition on a global scale. Opponents of the designation argue that the Holocene—the current epoch that began approximately 11,700 years ago—remains sufficient, or that human influence is too brief to be measured on a geological timescale. Yet, the physical evidence in the sediment layers is clear: the stratigraphic signature of the mid-twentieth century is distinct, synchronous, and irreversible. Formally defining the Anthropocene not only recognizes this geological reality but also provides a vital scientific framework for understanding the profound physical transition our planet is undergoing.

Passage B

The proposal to formally declare the Anthropocene as a new geological epoch has sparked intense debate, not only among stratigraphers but also among historians, archaeologists, and ecologists. While geologists search for a specific boundary line in the sediment—a "golden spike" in the physical record—many researchers argue that dividing human history into "before" and "after" the mid-twentieth century oversimplifies a long and complex relationship. The "early Anthropocene" hypothesis, for instance, suggests that human transformation of the planet began thousands of years ago with the rise of agriculture, widespread deforestation, and the domestication of livestock, which gradually altered atmospheric greenhouse gas concentrations long before the industrial era. Focusing exclusively on the stratigraphic markers of the 1950s risks ignoring the centuries of cumulative human actions that paved the way for our current ecological state. Nevertheless, even proponents of the early Anthropocene model do not deny the unique significance of the mid-twentieth century. The post-1950 era represents an undeniable planetary inflection point: an unprecedented, exponential acceleration in energy consumption, industrial output, and ecological disruption that operates at a truly global scale. While early agricultural societies modified local ecosystems, the Great Acceleration of the twentieth century fundamentally destabilized global biogeochemical cycles. Ultimately, whether the Anthropocene is formally codified in the official geological time scale or remains an informal term, it highlights a crucial truth: human activity has transitioned from a localized ecological force to a primary driver of the Earth's global environmental systems.

Based on the passages, the authors of Passage A and Passage B would most likely agree with which of the following statements?