- Artificial birth control.
- The coming of the Replicator--or close enough--for foodstuffs and for things made out of metal, wood, plastic, and sound.
- The coming of information technology in whatever its flowering will be.
- The death of global distance.
- Plus whatever disasters lurk at the bottom of not the Pandoran but the Promethean Box of 1700-2300.
Neither list credits the importance of the various agricultural revolutions, both as enabling the explosion of population and the expansion of non-subsistence labor, the ability to spend time on things other than feeding and clothing oneself.. Agriculture these days is such a small part of the economy it doesn't get much attention in public discussions.