President Donald Trump last week announced the repeal of a major Environmental Protection Agency (EPA) regulation on greenhouse gasses — the 2009 "Endangerment Finding."

For the past 16 years, the scientific conclusions that: greenhouse gases in the atmosphere threaten public health and greenhouse gases from motor vehicles contribute to pollution threatening public health, have guided EPA emission standards under the Clean Air Act. Now, scientists and environmental groups warn that removing the finding could have grave implications for public health.

One of the scientific foundations of that policy is rooted in San Diego research dating back to 1958. We outline the connection and why local scientists are concerned.

Guest:

• Tammy Murga, environment reporter, KPBS