"Approximately 80% of our air pollution stems from hydrocarbons released by vegetation, so let's not go overboard in setting and enforcing tough emission standards from man-made sources"

This quote by Ronald Reagan is highlighting the value of not over-regulating man-made sources of air pollution. Reagan is pointing out that the majority of air contamination is in fact caused by hydrocarbons released by greenery, not man-made sources. He is recommending that we need to not be too strict in setting and enforcing emission requirements from manufactured sources, as this would not have a considerable effect on air pollution levels. Rather, Reagan is suggesting that we should concentrate on decreasing the amount of hydrocarbons launched by greenery, as this would have a much greater effect on air contamination levels. This quote is a reminder that we must not ignore the natural sources of air contamination and that we need to concentrate on decreasing emissions from all sources.