OilResults suggest the mantle is more efficiently cooled, which would ultimately weaken many tectonic activities driven by the mantle convection more rapidly than expected from conventionally believed thermal conduction behavior." When the planet goes cold, it'll lose its magnetic field, which shields Earth from harmful cosmic radiation. At that point, Earth would become a sterile, uninhabitable rock. The researchers didn't hazard a guess as to how many more years life on Earth could exist. And to make things worse the oil layer we are depleting that separates us from the core will allow us to cool faster allowing our magnetic field to weaken faster