Uber is making a massive long-term bet: driverless cars. Hydrogen fuel cells, if practical, would be worth massive investment, but folks who would use them see

Uber is making a massive long-term bet: driverless cars. Hydrogen fuel cells, if practical, would be worth massive investment, but folks who would use them seem to have decided that lithium ion batteries would make more sense and are making a $5 billion investment in that. There are a lot more smaller companies pursuing small ambitions, but that makes sense: a small company doesn't have the resources to tackle a capital-intensive problem without first demonstrating that it is a somewhat-reasonable bet.