Recent scientific evidence across disciplines points to an unstable Greenland Ice Sheet (GrIS), which is particularly concerning in view of a rapidly changing Arctic system, its impacts on local communities and eco-systems, and the regional and global impacts of sea-level rise. The goal of this session is to better understand the GrIS stability problem by a holistic, all-hands-on-deck approach. We invite papers addressing the stability of the GrIS via: (i) modern and paleo observations, from ice-penetrating radar and geophysical studies, to remote sensing observations, to studies investigating the former dimensions of the GrIS, (ii) model experiments that assess the GrIS response to warming across paleo, modern, and future timescales, and (iii) investigation of the recent change of state of the GrIS including its glaciology, hydrology, and geothermal regime.