Scientists have delivered the first measurements of Greenland Ice Sheet thickness change using data from ESA and NASA ice satellite missions. With global warming causing the Greenland Ice Sheet to melt and flow more rapidly, raising sea levels and disturbing weather patterns across our planet, precise measurements of its changing shape are of critical importance for tracking and adapting to the effects of climate warming. CryoSat-2 and ICESat-2 – the ESA and NASA ice satellite missions – both carry altimeters as their primary sensor, but they make use of different technologies – radar and laser – to collect their measurements. The missions are therefore highly complementary, and combining their measurements has been a holy grail for polar science.