There are a great number of positives when people operate and work on urban farms and community gardens: access to fresh and healthy foods, community building and reduced transportation needs in areas known as food deserts. A new study from the University of Michigan discovered some areas where improvement is needed with some urban farms and gardens creating a carbon footprint much greater than conventionally grown produce. WEMU's David Fair checked in with Benjamin Goldstein to learn more about the research and why it caused such an uproar. Goldstein is co-lead author of the study.