Sunday marks the 42nd Earth Day observance in the United States.
Much has changed since the first Earth Day in 1970. Back then, many bodies of water in the US, including Lake Erie, were considered dead. And air pollution was rampant.
Judith Enck is regional administrator of the U-S Environmental Protection Agency. On the Capitol Pressroom on WBFO and AM 970, Enck said while real progress has been made on improving the environment, challenges remain.