Data centers use water directly, with cooling water pumped through pipes in and around the computer equipment. They also use water indirectly, through the water required to produce the electricity to power the facility.
The initial mass of a star determines its rate of hydrogen burning and subsequent evolution into heavier element fusion. This is integrated into the main sequence, a systematic classification for stars.
Coal remains one of the most heavily used energy sources globally, fueling economies from China to the US and practically every country in between. Despite the rise of green energy, coal consumption is integral for these economies.