Totally unrelated though, and just a coincidence. The word meme in the way we use it today was coined by Richard Dawkins in (IIRC) The Extended Phenotype. I presume it’s an abbreviation of Mental Gene, or something like that. The idea was that a meme is an idea or concept that can fight for survival amongst other ideas, just as a gene tries to survive being being a good fit to its environment

It’s become a mass noun, but only thanks to years of people using it wrongly. It was originally very much the plural of datum

This is greenwashing. Global aviation uses almost 100 billion gallons of fuel per year. If we even began to address a fraction of that with magic new fuels (which won’t happen) it would require incredible amounts of growing, and if we had that sort of amount of agricultural capacity available on this planet, capable of producing crops at a price the aviation industry is prepared to pay, we wouldn’t have any hunger on the world.

Don’t fall for this. There isn’t such a thing as green aviation. I’m not saying there should be no flying, but we can’t carry on as we are and magic away the consequences. In particular, don’t fall for the snake oil salesmen trying to distract you with appealing non-solutions