Traveling from a fairly walkable, but still car dependent midwestern city to NYC and also Europe in the last few months, it's amazing how much our living environment contributes. My first day in NYC and Europe I put in about 14k steps and at least according to my phone, one of those days I burned 750 cal just walking around to various places. Just by living my life I was WAY more active.
Making the good choice the easy/only choice is the only way to solve this problem long-term (without drugs)
I agree. I lived in West LA for a few years and noticed that I was just walking around a lot more than in previous locations. I measured it to be typically 5 to 10 miles per day (I don't recall the number of steps but I recall getting close to 30k/day on some days). And I wasn't going out of my way to go walking --- it just happened because I walked to work, to get groceries, to visit friends, to go to the movies, etc. To me, the best long-term answer is also to change the environment to be more amenable to walking.