Data centers gobble up roughly 2% of global electricity, which translates to around 1% of energy-related greenhouse gas emissions. Startups like Netherlands-based Asperitas, Spain’s Submer, and UK-based Iceotope use a non-conductive, dielectric liquid that absorbs the heat from the servers much better than air. The heat is then transferred from the liquid to a cooling system. This method keeps the servers cool without needing fans or air conditioners.