752: Carbon Cost Of Urban Gardens And Commercial Farms | Why There's No Superbloom This Year

Science Friday

Some food has a larger carbon footprint when grown in urban settings than on commercial farms, while for other foods the reverse is true. Also, what’s the difference between wildflowers blooming in the desert each spring, and the rare phenomenon of a “superbloom”?

The Carbon Cost Of Urban Gardens And Commercial Farms

If you have a home garden, you may be expecting that the food you grow has less of an environmental impact than food grown on large commercial farms. But new research throws some cold water on that idea. A study led by scientists at the University of Michigan examined 73 small urban gardening sites across the U.S., the U.K., France, Poland, and Germany, and found that food grown in urban settings produced six times more carbon emissions per serving than commercially grown food. The bulk of these emissions (63%) came from the building materials used for items like raised garden beds.

However, there are some foods that have a smaller carbon footprint when grown at home. They include crops like tomatoes and asparagus, which sometimes need to be flown long distances or require power-hungry greenhouses when grown commercially.

Jason Hawes, PhD candidate in the School for Environment and Sustainability at University of Michigan and lead author of the study which was published in Nature Cities, breaks down the results of the research with Ira. They talk about how urban farmers have responded to the findings, the positive social benefits of community gardens, and what home gardeners can do to lessen their carbon footprint.

Why There Won’t Be A Superbloom This Year

In California, wildflowers are in bloom.

Last year, there was a superbloom. Though there’s no official criteria, a superbloom is when there is an above average number of wildflowers blooming, mostly in desert regions of California and Arizona. It’s an explosion of color in regions that typically have sparse vegetation.

About a month ago, a few news articles hinted that maybe, just maybe, we were in for another superbloom year. Turns out we’re not.

Who decides when there’s a superbloom anyway? And why did this year turn out not to be a superbloom after all?

To answer those questions and provide an update on the state of California’s wildflowers, SciFri producer Kathleen Davis talks with Dr. Naomi Fraga, director of conservation programs at the California Botanic Garden, and research assistant professor at Claremont Graduate University.

Transcripts for each segment will be available after the show airs on sciencefriday.com.

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