What central idea or lesson about life does Carson draw from her observation of the marginal world?

Carson draws the lesson that the interconnectedness and resilience of nature in the marginal world can serve as a source of inspiration and renewal for humanity. Through observing these often-overlooked ecosystems, she emphasizes the importance of appreciating the beauty and complexity of all life forms, no matter how seemingly insignificant. Ultimately, Carson highlights the need for humans to coexist harmoniously with nature to ensure the well-being of our planet.