Could a rock formation help reduce global warming?

Nature Steps Up: There’s a Rock Formation That Stands Ready to Sequester Our CO2 Under the crust that wraps Earth is an 1,800-mile-deep mantle of rock. The most common rock in the mantle is called peridotite. In some spots around the globe — Oman, New Guinea, the Aegean coast, some Pacific islands, and the coast of California — the peridotite layer has found its way to the surface.