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  2. Hydrogen production - Wikipedia

    en.wikipedia.org/wiki/Hydrogen_production

    A small part (2% in 2019 [42]) is produced by electrolysis using electricity and water, consuming approximately 50 to 55 kilowatt-hours of electricity per kilogram of hydrogen produced. [43] Illustrating inputs and outputs of electrolysis of water, for production of hydrogen and no greenhouse gas

  3. High-speed rail - Wikipedia

    en.wikipedia.org/wiki/High-speed_rail

    Even using electricity generated from coal, fossil gas or oil, high-speed trains are significantly more fuel-efficient per passenger per kilometer traveled (despite the greater resistance to motion of the railcars at higher speeds) than the typical automobile because of economies of scale in generator technology [108] and trains themselves, as ...

  4. Quantum key distribution - Wikipedia

    en.wikipedia.org/wiki/Quantum_key_distribution

    [47] [48] [49] By October 2017, a 2,000-km fiber line was operational between Beijing, Jinan, Hefei and Shanghai. [50] Together they constitute the world's first space-ground quantum network. [ 51 ] Up to 10 Micius/QUESS satellites are expected, [ 52 ] allowing a European–Asian quantum-encrypted network by 2020, and a global network by 2030.

  5. Liberia - Wikipedia

    en.wikipedia.org/wiki/Liberia

    The oldest counties are Grand Bassa and Montserrado, both founded in 1839 prior to Liberian independence. Gbarpolu is the newest county, created in 2001. Nimba is the largest of the counties in size at 11,551 km 2 (4,460 sq mi), while Montserrado is the smallest at 737.069 sq mi (1,909.00 km 2). [95]

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