High-resolution, global quantification of fossil fuel CO2 emissions is emerging as a critical need in carbon cycle science and climate policy. The fossil fuel data assimilation system (FFDAS) estimates global high-resolution fossil fuel CO2 emissions. Originally created by Dr. Peter Rayner, collaboration with Dr. Kevin Gurney has advanced and improved the FFDAS product. Current results cover the years 1997 to 2015 at a spatial resolution of 0.1°. Stay tuned for a new version at 1 km2 for more recent years.