‘Green Bitcoin Mining’: The Big Profits In Clean Crypto

Growing up in rural western Pennsylvania in the early 1970s, Bill Spence played with his pals on piles of coal waste, oblivious to the toxic heavy metals right under his feet. After working as an oil industry engineer out west, he returned home in the 1990s and found the piles—known as “gob,” for “garbage of bituminous”—still pockmarking the landscape. The present worry is that these unlined pits are leaching deadly carcinogens into the groundwater—or, worse, that they will catch fire and start polluting the air, too. (Of the 772 gob piles...