It's a fantastic list; I'd like to comment on how some of the problems are already solved (outside the U.S.) or not cast properly.
> Healthcare in the United States is badly broken. We are getting close to spending 20% of our GDP on healthcare; this is unsustainable.
That's mostly a policy problem, not a technology problem. Countries with single-payer healthcare spend massively less on it per % of GDP than the United States with its pro-profit healthcare system, and American doctors and healthcare corporations end up being fabulously more rich than in those countries. (And they still have private healthcare, like in Sweden, which competes with public healthcare organizations.) The other reason healthcare costs are getting higher is that people are getting older and thus more sick. That's a generational bump, there's very little we can do about that. Not that I'm opposing the types of ideas YC is after in this sector (preventative medicine and better sensing/monitoring), just that the premise is wrong that it's a technological problem.
> At some point, we are going to have problems with food and water availability.
That's because we dedicate most of our water and land resources to feeding cattle that we then eat. Innovations that will have the most impact in that sector will involve weaning people from animal products. Stuff like Beyond Eggs and lab-grown meat.
> It’s not a secret that saving money is hard, and that people tend to be bad at doing it. The personal savings rate has largely been falling since the early 80s.
Sure, some super-low-cost index funds would help, but the main problem here is two-fold: 1) real incomes are stagnant, due to government policies favouring corporations and 2) government/pension funds are much better at providing good ROI on investment than individuals can. Once again policy change is much more likely to have a massive impact than trying to improve the individual worker's investment returns. Collect retirement contributions at the source, and have the best investors in the country manage them. Without taking a profit for themselves. It's done elsewhere.
> Healthcare in the United States is badly broken. We are getting close to spending 20% of our GDP on healthcare; this is unsustainable.
That's mostly a policy problem, not a technology problem. Countries with single-payer healthcare spend massively less on it per % of GDP than the United States with its pro-profit healthcare system, and American doctors and healthcare corporations end up being fabulously more rich than in those countries. (And they still have private healthcare, like in Sweden, which competes with public healthcare organizations.) The other reason healthcare costs are getting higher is that people are getting older and thus more sick. That's a generational bump, there's very little we can do about that. Not that I'm opposing the types of ideas YC is after in this sector (preventative medicine and better sensing/monitoring), just that the premise is wrong that it's a technological problem.
> At some point, we are going to have problems with food and water availability.
That's because we dedicate most of our water and land resources to feeding cattle that we then eat. Innovations that will have the most impact in that sector will involve weaning people from animal products. Stuff like Beyond Eggs and lab-grown meat.
> It’s not a secret that saving money is hard, and that people tend to be bad at doing it. The personal savings rate has largely been falling since the early 80s.
Sure, some super-low-cost index funds would help, but the main problem here is two-fold: 1) real incomes are stagnant, due to government policies favouring corporations and 2) government/pension funds are much better at providing good ROI on investment than individuals can. Once again policy change is much more likely to have a massive impact than trying to improve the individual worker's investment returns. Collect retirement contributions at the source, and have the best investors in the country manage them. Without taking a profit for themselves. It's done elsewhere.