In the article “Want to be green? Forget mass transit. Work at home”, we shall discuss about one of the biggest environmental problem caused by major cities. As we all know, big cities build up big traffic, without doubt. We can observe this phenomena in our local city: Montreal. You may ask yourself: “Expanding highway routes will probably resolve this issue?”. This is wrong, take Los Angeles as an example. You may be surprised because a major city with routes expanding up to eight lanes still have transit issues. As you build more roads, more cars will travel on them.