The Keeling Curve Foundation (KCF) is a young California-based nonprofit that seeks to advance, promote, and protect long-term environmental observations (LTOs). Founded in 2022 by Scripps scientist Ralph Keeling, the Foundation fulfills Charles D. Keeling’s personal wish to inspire other scientists to sustain environmental measurements year on year. KCF works with its Science Advisory Council and affiliated scientists to identify long-term observations (LTOs) at risk. We convene events, produce reports, and advance public understanding of the importance of this science.