Sixteenth-century “father of mineralogy” Georgius Agricola critiqued “these attacks, which are so annoying,” made by those protesting how mining exterminated animals and poisoned brooks and streams. “With the metals that are melted from the ore,” he explained, “birds without number, edible beasts, and fish can be purchased elsewhere and brought to these mountainous regions.”

Plutarch related that news of the Athenians’ brutal defeat at Syracuse during the Peloponnesian Wars first came from a stranger who told the story at a barbershop “as if the Athenians already knew all about it.” When the barber spread the news, city leaders branded him a liar and an agitator. He was “fastened to the wheel and racked a long time.” Official messengers later came with the “actual facts of the whole disaster,” and the barber was released.

Hatches of Rocky Mountain locusts (Melanoplus spretus) in 1874 and 1875 brought swarms up to 1,800 miles long and 110 miles wide across the Great Plains. Numbers were estimated in the trillions. Farmers risked starvation. The swarm is believed to have been the largest mass of living insects ever witnessed by modern man—but within thirty years the species disappeared. “I can’t believe M. spretus is extinct,” said ecologist Dan Otte in 2014. “But where to look for it?”

“Thank the good God we have all got through and the only family that did not eat human flesh,” wrote fourteen-year-old Virginia Reed, a surviving Donner Party member, in an 1847 letter. “Don’t let this letter dishearten anybody and never take no cutoffs and hurry along as fast as you can.” Reed reported being “pleased with California, particularly with the climate.” 

The opening of a particle accelerator at Brookhaven National Laboratory in 2000 inspired fears that high-speed collisions might launch a chain reaction that could turn the earth into a hyperdense sphere about one hundred meters across. A risk calculation determined this to be unlikely; if the collider were to run for ten years, the chance was no greater than 1 in 50 million. “The word unlikely, however many times it is repeated,” wrote concerned scientists, “just isn’t enough to assuage our fears of this total disaster.”