It's a feedback loop.

I've always felt that the most important part of engineering was feedback loops.

Maybe nature is the greatest engineer ever?

The most important part of engineering is problem-solving, which feedback loops don't necessarily do. The reason we are here as engineers is: 2.5 billion years ago, the earth made cyanobacteria, which flourished, then flooded the earth with toxic oxygen, killing almost all life on the planet. The initial feedback loop didn't solve a problem, it destroyed a use case. That's not a solution to a problem that an engineer would choose, even if those organisms that came after were pretty happy about it...