What metaphor does the author use to explain the importance of small changes in the environment?

The author uses the metaphor of a “gigantic engine” to explain the importance of small changes in the environment. In this metaphor, Earth functions like an interconnected, finely-tuned machine, where even the smallest parts play a crucial role in maintaining balance. Just as minor adjustments can affect the performance of an engine, small changes in any part of Earth’s ecosystem can lead to significant impacts on the global climate. This metaphor emphasizes how delicate and interdependent nature is, illustrating the far-reaching consequences that seemingly small environmental changes can have on the entire planet.

This question related to Chapter 3 English Vistas Class 12th NCERT.
From the Chapter 3. Journey to the End of the Earth.
Give answer according to your understanding.