As a 90s kid a remember peak oil. It was taught every where except in one class - economics. The teacher was adamant we would never run out of oil because as the supply dwindled the cost would go up and new oil or other forms of energy would be found. Makes perfect sense now but at the time this was not the norm. Economics ended up being my favorite class. Slightly related he also predicted the internet bubble collapse as I was explaining how I as a teenager was making money on the internet doing nothing in 99 - and his response was that will end because you don’t get money for nothing forever.