Behind the Green Mask

Have you wondered where these terms ‘sustainability’ and ‘smart growth’ and ‘high density urban mixed use development’ came from? Doesn’t it seem like about 10 years ago you’d never heard of them and now everything seems to include these concepts? Is that just a coincidence? That every town and county and state and nation in the world would be changing their land use/planning codes and government policies to align themselves with…what?