Scientific American: In the last post I presented results from my poll on the importance of cars to your everyday life. The results suggest, simply put, that its importance is sliding downwards. Yet, are we seeing this outside the US and elsewhere in similar countries? And if so, is it not just because of the global economic recession? To answer this question, we can begin with one graph you might have seen before by Professor Michael Sivak of the University of Michigan. In it you can divine two things: first, it appears...