Thomas Lauvaux has developed atmospheric inversion systems to quantify sources and sinks of carbon at regional scales. He works on carbon cycle data assimilation systems for Earth sciences in support of climate policies over agricultural landscapes, natural ecosystems, and over centers of human activities such as large cities and natural gas shales. Among other projects, he is currently participating to a large research effort to quantify carbon emissions from urban centers (INFLUX project) in order to monitor and verify mitigation policy efforts in large metropolitan areas. He has implemented different greenhouse gas mesoscale inversion systems assimilating tower and aircraft in situ data, remote sensing data from satellite and ground-based sensors, and now combining meteorological assimilation systems with carbon inversions.