Calera Inc Discovers Way Capture Carbon Dioxide Emissions California Power Plant Use Make Q32905215

Calera, Inc. discovers a way to capture carbon dioxideemissions at a California power plant and use them to make cement.This is a win for the power company, which needs to reduce itscarbon dioxide emissions, and a win for Calera. Calera decides topatent this invention. What kind of patent would this be? Amachine? A composition of matter? A manufacture?