particularly given the cost premium of the green form of the gas over fossil-fuel-powered, ‘grey' hydrogen. Hydrogen-consuming industry will have to be incentivized away from the conventional ...

We think of Earth as the “blue” planet ... as rainwater (“green water”). It also captures water used to make wastewater generated in manufacturing safe for reuse (“grey water”).

The researchers analyzed the potential of hydrogen in all of its possible forms in Saudi Arabia, including green, blue, grey and turquoise ... limited water resources, a lack of incentives ...