BATGE was an activity that provided research on nitrous oxide (N2O) and the compound effects of nitrogen sinks. It focused on trace gas emissions from terrestrial systems. BATGE helped to gain understanding of what factors control these fluxes and assessed the effects of land use change. BATGE was part of IGAC’s Phase I Tropical Atmospheric Chemistry focus and later merged into IGAC’s Biosphere-Atmosphere Trace Gas Exchange (BATREX) activity.