An invisible chemical rain is falling across Earth

An invisible chemical rain is falling across Earth

According to new research, chemicals once introduced to protect the ozone layer are now spreading a long-lasting pollutant across the planet, raising concerns about an environmental problem that may be impossible to reverse. The pollutant is trifluoroacetic acid, or TFA, a member of the ‘forever chemicals’ family because it does not naturally break down. Scientists have discovered that TFA is being created in the atmosphere when commonly used in…