The MapBiomas project developed a free and open-source platform to monitor Brazilian land use land cover (LULC) changes since 1985. To increase its analytic power, we developed the Environmental Fragility Mapping System (EFMS), using Google Earth Engine (GEE). Environmental fragility (EF) analysis has its origins in ecodynamics, and it is composed of potential environmental fragility (PEF) and emergent environmental fragility (EEF). The advantage of EF analysis over LULC analysis is its flexibility in evaluating multiple scenarios for different aspects of environmental challenges. EFMS calculates three environmental fragility indexes: potential fragility index (PFI), land cover fragility index (LCFI), and emergent fragility index (EFI). Combined with LULC change analysis from the MapBiomas, EFMS can provide spatial analysis and generate maps and data for environmental management. In this article we describe the EFMS method, provide the code and present a case study to generate fragility scenarios for selecting priority areas for environmental recovery.