• Dave Harmon, PW editor

Clean Air Act credited with changes that have reversed acidification in Acadia NP lakes

Acadia National Park is known for its beautiful lakes—and they can tell scientists a lot about the health of the environment. New research shows that regulations to reduce human-caused sulfur in the atmosphere have made a difference for lakes in Acadia National Park, though climate change may slow that recovery.

Research from the 1990s showed that human-caused atmospheric pollution in the 20th century caused the acidification of lakes across eastern North America starting in the 1940s. Acidification of lakes causes the decrease of dissolved organic carbon in lakes, which impacts lake ecology and makes water appear clearer.

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