Here’s our round-up for the week.
- How some firms game Yelp reviews.
- 10 largest green roofs worldwide. See also: Our 2011 Green Roof Guide.
- Economic power of top U.S. cities, 1978 to now.
- Learn how to tumblr from Mr. Tumblr himself. Related: Bates Nursery is killing it on Tumblr.
- Above: Living wall installation at the Plaza Hotel in New York. (via @PIAgrows)