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2. Hydrogen production - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_production

   As of 2020, estimated costs of production are $1–1.80/kg for grey hydrogen and blue hydrogen, [176] and $2.50–6.80 for green hydrogen. [176] 94 million tonnes of grey hydrogen are produced globally using fossil fuels as of 2022, primarily natural gas, and are therefore a significant source of greenhouse gas emissions. [177] [178] [179] [180]

3. Technological singularity - Wikipedia

   en.wikipedia.org/wiki/Technological_singularity

   One version of intelligence explosion is where computing power approaches infinity in a finite amount of time. In this version, once AIs are performing the research to improve themselves, speed doubles e.g. after 2 years, then 1 year, then 6 months, then 3 months, then 1.5 months, etc., where the infinite sum of the doubling periods is 4 years.

4. Liberia - Wikipedia

   en.wikipedia.org/wiki/Liberia

   The government divided its offshore waters into 17 blocks and began auctioning off exploration licenses for the blocks in 2004, with further auctions in 2007 and 2009. [ 171 ] [ 172 ] [ 173 ] An additional 13 ultra-deep offshore blocks were demarcated in 2011 and planned for auction. [ 174 ]

5. High-speed rail - Wikipedia

   en.wikipedia.org/wiki/High-speed_rail

   High-speed rail (HSR) is best suited for journeys of 1 to 4 + 1 ⁄ 2 hours (about 150–900 km or 93–559 mi), for which the train can beat air and car trip time. For trips under about 700 km (430 mi), the process of checking in and going through airport security, as well as travelling to and from the airport, makes the total air journey time ...