As Earth Day Has Grown, So Have the Eco-Challenges

April 22, 2015 2:17 PM

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You'd expect climate change and protecting endangered species to be among the top environmental challenges facing the U.S. -- but antibiotics and nuclear weapons? They too came up when NBC News surveyed a cross-section of experts who reflect a movement that's evolved since the first Earth Day on April 22, 1970.

There's the general who battled Katrina. The Stanford economist who calls himself a "free market environmentalist." The former lawmaker who helped shape landmark environmental policy. The activist who started Earth Day activities in the U.S. And the lawyer hell bent on turning low-income Americans i...

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