[tener]

While good public transport helps to cut the carbon emissions, it also isn't free and can only be established above certain population density. This creates pressure for people to live in a big cities and that causes a lot of problems.

[mvanbaak]

or, get a bike. healthy, no emissions, and on top of that, cheap.

[reidjs]

True, but not everyone lives close enough to work or is in physical shape to bike. Most people should, though :)

[tener]

The bikes are nice idea, but hardly panacea. You need to design the city around it (costly, conflicts with other usages), isn't possible for variety of people (age, disability, distance).

I used to drive 40km to work every day in single direction. Not gonna happen with a bike.

[mvanbaak]

Electric bikes are a thing ;P