The noise we make is hurting animals. Can we learn to shut up?

When the covid-19 pandemic started, Jennifer Phillips thought about the songs of the sparrows.

They were easier to hear, because the world had suddenly become quieter.

Car traffic plummeted as people sheltered at home and shifted to remote work.

Air travel collapsed.

Cities—normally filled with the honking, screeching, engine-gunning riot of transportation—became as silent as…