Carbon-rich water sinks deep underground, locking away CO2 where it can’t harm the climate anymore, even during earthquakes.

When oil and natural gas are extracted from deep within Earth, salt water almost always comes with it. Operators add water from near-surface sources to this saline to expedite oil recovery and ...

This thermal energy is contained in the rock and fluids beneath Earth’s crust. It can be found from shallow ground to several miles below the surface ... hot water under roads and sidewalks ...