Last month, I joined nearly 500 former and current employees of National Geographic, where I was executive vice-president and chief science and exploration officer for 17 years, urging the institution to take a public stance against the Trump administration’s reckless attacks on science. Our letter pointed out that the programs being dismantled are “imperative for the success of our country’s economy and are the foundation of our progress and wellbeing. They make us safer, stronger and more prosperous.” We warned that gutting them is a recipe for disaster.

In the face of this danger, none of us can remain silent.

I say this from the unique perspective of having been closely involved in the two most significant environmental disasters in US history: the Exxon Valdez and Deepwater Horizon oil spills. Fifteen years ago this Sunday, an enormous explosion tore through the BP Deepwater Horizon drilling rig and unleashed an environmental catastrophe that devastated the Gulf of Mexico. The explosion triggered the release of more than 3m barrels of oil that polluted 1,300 miles of coastline from Louisiana to Florida. Eleven lives were lost, ecosystems were ravaged and the economic toll soared into the billions.

I served on the National Commission on the BP Deepwater Horizon Oil Spill, which investigated the root causes of the disaster, and before that I led the federal government’s implementation of the Exxon Valdez Oil Spill Restoration Plan. I have witnessed first-hand the human and economic toll exacted by these events. Men and women who, for generations, had made a living from the sea were suddenly confronted with the possibility that an entire way of........

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