Energy associated with ocean currents can be captured, just like wind currents can with wind turbines. Ocean turbines can be fixed to the seabed, or float nearer the surface with moorings attached to the seafloor. No one technology has yet emerged as a clear winner, but this Japanese turbine, which has been in development and testing for many years is clearly still in the race. After successful recent trials, the company is set to scale up to a 2 megawatt unit. https://www.sciencealert.com/japan-s-dropping-a-kaiju-sized-turbine-into-the-ocean-to-fish-for-limitless-energy
Airbus has three hydrogen-powered concepts for 'zero emission' commercial aircraft on the drawing board, two of which are likely to be flying by 2035.
The European airplane maker has previously said hydrogen “holds exceptional promise as a clean aviation fuel and is likely to be a solution for aerospace and many other industries to meet their climate-neutral targets.”
The ZEROe turboprop is capable of carrying up to 100 passengers around 1,000nm, making it best suited to short-range trips.
The ZEROe ‘turbofan’ boosts passenger capacity to the 120-200 bracket while extending range to in excess of 2,000nm: sufficient for a transcontinental jaunt between Australia's east and west coasts.
https://www.executivetraveller.com/news/airbus-zero-emission-hydrogen-aircraft-con
Small scale wind isn't very popular for residential applications. But a new turbine which mimics the natural spiral design of a nautilus shell might soon provide an alternative to solar. It claims to be quieter but also very efficient, such that one turbine can produce 1,500kwh/annum. In Sydney, an average household (2.4 persons) consumes about 5,200kwh/annum.https://newatlas.com/the-archimedes-liam-f1-urban-wind-turbine/32263/
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