Clean Air Act saved 1.5 billion birds

Source: Science Daily

US pollution regulations meant to protect humans from dirty air are also saving birds. So concludes a new continent-wide study. Study authors found that improved air quality under a federal program to reduce ozone pollution may have averted the loss of 1.5 billion birds during the past 40 years.

https://www.sciencedaily.com/releases/2020/11/201124150845.htm