By the way there was a changing-of-the-guard moment this month in New York City that passed with little fanfare when figures released by the city's Taxi and Limousine Commission showed that there are now 4,088 registered Uber cars compared with 13,587 yellow cabs. Map: These will be Europe's most polluted cities by 2030 2

, making you feel pretty lucky when you got a yellow from your iPhone. We did the best we could to get more yellows on the road but New York's TLC (Taxi and Limousine Commission) put up obstacles and roadblocks in order to squash the effort around e-hail, which they privately have said is legal under the rules. We'll bite o