Dig down about a mile or two in parts of the United States and you’ll start to see the remains of an ancient ocean. The shells of long dead sea creatures are compressed into white limestone, surrounding brine aquifers with a higher salt content than the Atlantic Ocean.

Last summer, ExxonMobil sponsored week-long camps to teach grade school students from Texas, Louisiana, and Mississippi about the virtues of these aquifers, specifically their ability to serve as carbon capture and sequestration wells, where oil, gas, and heavy industry can bury harmful emissions deep underground. In one exercise, students were given 20 minutes to build a model reservoir out of vegetable oil, Play-Doh, pasta, and uncooked beans. Whoever could keep the most vegetable oil (meant to represent liquified carbo

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