An average quality lawn captures how many times the carbon output of a typical gasoline-powered mower?

• A. 2
• B. 3
• C. 4
• D. 5

Answer: (C)

Carbon capture by a lawn comes from photosynthesis, where grass converts atmospheric CO2 into biomass, and from storing carbon in the soil as organic matter through root growth and turnover. A healthy, average-quality lawn develops a robust root system and dense turf that continually adds carbon to the soil year after year. A gasoline-powered mower emits CO2 during operation, but those emissions are tied to usage and don’t accumulate in the same way soil carbon does over time. When you compare typical annual carbon sequestration by a lawn to the CO2 emitted by running a mower, the lawn’s net carbon storage is about four times greater. This fourfold relationship reflects the lawn acting as a long-term carbon sink, whereas mower emissions are a finite, yearly event. Good lawn practices that boost soil carbon—proper mowing height, aeration, balanced fertilization, and avoiding overwatering—can increase sequestration, while using fewer or cleaner-powered tools reduces emissions.