Can agree with this (to a certain extent). Spending time in both America and Ireland, there's a definite difference in the extent to which "I can only get there by car versus public transit/other types of transport" is incorporated into the culture. By far, more urban/suburban/rural density with appropriate public transportation support leads to more freedom to walk, bike, etc. Geographically, however, there are clear reasons why places like the US and Brazil have a strong incentive to rely on cars over anything else. Distance between cities and towns, poor public transport (esp. outside of urban areas in the US), etc. cause this to be an issue.