Unfortunately I think this article only counts a commute if the person is driving. It may be refreshing to see the difference for people who walk, bike, or take public transit.
Personally, my bike commute makes me happier and healthier.
Personally, my bike commute makes me happier and healthier.
Using the bus or train is not unequivocally good (nor bad).
Of course it depends on your particular situation, but I live about three miles from the office so it's a fifteen-minute drive. If I bike, it's more like 45 minutes, I'm in constant danger of getting killed by idiot drivers, and there's a very big hill. If I catch public transport, it takes anywhere from half an hour upwards, it's filthy, often late, and I gotta share personal space with people I'd rather not share personal space with.
Nope, when you live three miles from work in a city with bad traffic, often-bad weather, and one very big hill, you're much happier if you're driving.