Journey to the end of the Earth Tishani Doshi Before you read | Class 12 English Notes

Human impact

This section focuses on the relatively recent but significant impact of human civilization on Earth's environment, particularly in relation to Antarctica. Human civilizations have existed for only about 12,000 years, a mere moment on the geological timescale. Despite this short duration, humans have dramatically altered natural ecosystems through urbanization, population growth, and the extensive burning of fossil fuels. This has led to increased carbon dioxide levels in the atmosphere, contributing to global warming. The section highlights the ongoing debate on climate change, raising questions about the potential melting of the West Antarctic ice sheet and disruptions to ocean currents like the Gulf Stream, which could have catastrophic consequences globally. Antarctica is crucial in this debate because it remains relatively pristine, having never supported a human population, and because its ice cores contain carbon records dating back half a million years. These records provide invaluable data for studying Earth’s climate history. The author introduces the Students on Ice program, which educates high school students about Antarctica’s environment to foster awareness and inspire future policy-makers. The program’s success lies in the direct experience of witnessing environmental changes, such as retreating glaciers and collapsing ice shelves, making the abstract threat of global warming tangible. The section also explains the ecological importance of phytoplankton in the Southern Ocean, which perform photosynthesis and form the base of the marine food chain. Depletion of the ozone layer threatens phytoplankton activity, which could disrupt the entire ecosystem and the global carbon cycle. The metaphor of caring for small things to ensure the health of the whole ecosystem underscores the delicate balance in Antarctica’s environment.

📊 Diagram: The section includes an image (img-2.jpeg) possibly showing human impact or Antarctic environment, illustrating the contrast between human civilization and the pristine Antarctic ecosystem.

🧪 Activity: No specific activity is mentioned in this section.

🔗 Connection: This section naturally leads to the next, 'Walk on the ocean,' where the author shares personal experiences that deepen understanding of Antarctica’s environment and human connection to it.