Bogotá has recently invested in a bunch of these expensive new green clean-running 'ecological' buses. Good for them, I guess.
That's particularly true since many TransMilenio buses, like this one above, belch out pollution.
However, do these new 'green' buses accomplish much when they're surrounded by dirty old machines...
...like this one?
Pollution isn't reduced by adding new vehicles, but by removing (or cleaning up) old ones.
By Mike Ceaser, of Bogotá Bike Tours