No climate-related startups in YC demo day 1. Nothing even in the neighborhood.
All 84 startups from Y Combinator’s S19 Demo Day 1: https://techcrunch.com/2019/08/19/all-84-startups-from-y-combinators-s19-demo-day-1/
Some people know that there are many possible futures. And once you accept this possibility - well, then you want to play your part getting us onto the best timeline possible. If you're one of these people - wherever you are, whatever you do, however you view your talents - this is the place for you.