Shallow groundwater is projected to warm on average between 2.1°C and 3.5°C by the end of the century, according to a world-first global groundwater temperature model. Shallow groundwater is projected to warm on average between 2.1°C and 3.5°C by the end of the century, according to a world-first global groundwater temperature model. Earth Sciences Environment Phys.org – latest science and technology news stories