Editor's Note: Twelve is one of seven private companies Inc. identified that's driving development within seven key pathways to net zero--eliminating one ton of greenhouse gases for every ton emitted.

GETTING TO NET ZERO will require us to harvest carbon, by collecting it where fossil fuels still burn or by pulling it from the air. But what to do with CO2 once we've got it? Ideas range from burying it in rock formations to pumping it into oceans. Or, thought Etosha Cave, she could make stuff. "We're taking CO2 available at any site," she says, "and converting it into useful products."