Others, horror of horrors, have even started taking the bus. In Vietnam, where many folks have been riding 50cc "motorbikes" for years, the reaction has been to switch to electric versions.

HO CHI MINH CITY: Vietnam’s motorbike drivers have always tended to treat red lights as suggestions, more slow down than stop. At rush hour, they have brought the same indifference to other rules, ...

In Vietnam's heavily polluted capital Hanoi, teenage taxi driver Phung Khac Trung rides his electric motorbike through streets jammed with two-wheelers belching toxic fumes.