This summer, national park employees and visitors were asked to do something highly unusual: report any signs that failed to make America look great. The effort, stemming from an executive order from President Donald Trump, has already resulted in the removal of signs about the horrors of slavery , massacres of Indigenous peoples , and the threat of climate change, even on lands directly in harm’s way.

Consider Acadia National Park in Maine. More intense storms and rising seas are accelerating erosion and killing native plants along its iconic coastline. Warmer temperatures are assisting the spread of an invasive insect that totally wiped out the park’s red pines. And yet earlier this month, park employees removed multiple signs explaining how climate change was contributing

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