[london888]

At least in London people are saying these apps are adding to road traffic and congestion, so the extra pollution (by other traffic being stuck also) might be harming health and causing early deaths to balance out any lives saved by stopping drunk drivers.

[dx034]

But that's because in London, Uber competes against public transport. That's not the case for many US cities (New York is an exception).

Even though as a London resident, I've never heard that argument. Most Ubers are either new petrol or even hybrid. Black cabs are (mostly old) diesel.