[dools]

Fundamentally we have only 1 problem worth solving: how to support 11bn people sustainably and equitably by 2050 (that's when the population peaks and levels out).

you can do a Wardley map that shows the needs of those people, then you can move down the chain of needs, until you find something you're apt to solve.

Personally I'm working on reducing eWaste by providing a global solution to carrying multiple mobile phones as many people do this for work.