Final answer:
The passage highlights the transformation of human lifestyle from being stationary in one's birthplace to the ease of travel and instant global communication, reflecting social mobility and the emergence of a global culture.
Step-by-step explanation:
The most important detail in the passage centers around how human activity is transforming our planet's overall environment and the profound changes in the way people live and connect with each other. In the given options, the answer that most closely reflects the essence of the passage is D "Imagine a world where people stayed in one place for most of their lives!" This statement captures the contrast between the historical limitations on travel and social interactions, and the modern world described in the passage where there is an unprecedented ease of travel, communication, and social mobility.
The passage explores the transformation of human lifestyle, with an emphasis on how the historical norm of staying in one's birthplace has given way to a global culture characterized by ease of travel, instant communication, and interconnection of people from different parts of the world. Today, people are able to travel vast distances quickly, share experiences across the internet, and participate in a global economy and culture.