Maersk plans to run a small container ship on e-methanol as early as 2023. 10,000 tonnes of carbon neutral methanol will be produced using solar powered electrolysis (to get the Hydrogen molecules) plus biogenic CO2 - extracted from biomass by rotting, combustion or other processing. Biogenic CO2 is considered "carbon neutral" if when accounting for the living plant absorbing CO2 whilst alive and releasing it when dead, there has been no net
increase in greenhouse gas (GHG) emissions on a life-cycle basis. https://www.maersk.com/news/articles/2021/08/18/maersk-secures-green-e-methanol
If you want a safe, clean and cheap product, simply don't use hazardous, toxic or rare materials when you build it. At Allegro Energy ( https://allegro.energy ), we followed exactly this strategy when we were looking for a sustainable energy storage option that is also compatible with a circular economy. So not only have we developed a water-based super- or ultracapacitor with the highest reported voltage to date, but also one that costs a fraction of the price compared to current technology. More details can be found here:https://www.pv-magazine-australia.com/2021/07/28/aussie-sta
Scientists have found a way to store energy in the red bricks that are used to build houses. Researchers led by Washington University in St Louis, in Missouri, US, have developed a method that can turn the cheap and widely available building material into “smart bricks” that can store energy like a battery. Although the research is still in the proof-of-concept stage, the scientists claim that walls made of these bricks “could store a substantial amount of energy” and can “be recharged hundreds of thousands of times within an hour”.Source: https://www.sciencefocus.com/future-technology/future-technology-22-ideas-about-to-change-our-world/
