Riley Duren, an alumni of NASA’s Jet Propulsion Laboratory, is the founder of Carbon Mapper, a free mapping tool that observes greenhouse gas pollution and fills in gaps in existing emissions data, accurate and detailed down to the facility or equipment level. It combines data from government and private sources, such as NASA’s EMIT instrument on the International Space Station, and a satellite called Tanager-1, owned and operated by Planet Labs, PBC, which partnered with Carbon Mapper to