The essence of your article is valid, and has real-life application. However, I don't think your comparison is technically fluent enough to support your article. Firstly, a variable like walkability relates to urban environments, not for rural or country areas in which it is almost impossible to travel on foot on a daily basis. Secondly, comparing countries instead of cities/ urban areas for this purpose gives inaccurate results. Developed countries has more people occupying cities, whereas it is the opposite for developing countries. Some countries are geographically larger than others, which makes it difficult not to use cars or public transport. Due to particular climate conditions in different parts of the world i.e. Dubai or cities in middle-eastern countries, it is also difficult for people to walk outdoors. Yes, urban design can certainly encourage walkability, and it should. But, it should be viewed in correct perspective.