Dark Matter: Inside the Compost Cycle: Science on the SPOT

How does San Francisco's 600 tons of compostable waste become a nutrient-rich material that improves the quality of our local wines and more? Agronomist Bob Shaffer, Northern California's "compost guy," takes QUEST into the composting process.
Take Action: In the US, we throw away roughly 40 percent of our food supply every year. Find out more on Sustainable Table.