Clean Air Act

Passed in 1963 after incidents like the Donora smog, it targeted air pollutants like CO2, resulting in significant improvements in air quality.

Endangered Species Act

Enacted in 1973 to protect species with critically low populations or facing extinction, successfully preventing any listed species from going extinct.

Montreal Protocol

Established in 1987, this international agreement united 196 nations to phase out chlorofluorocarbons in refrigerants, protecting the ozone layer and the well-being of humanity.