All Green is Not Good
Monday, February 22nd, 2010A new study by University of California Irvine researchers compared the amount of greenhouse gases absorbed by ornamental turfgrass to the amount emitted in the irrigation, fertilizing and mowing of the same plots.
When the greenhouse gas emissions from those inputs were measured in four parks near Irvine, they found that the inputs equalled or were greater than the amount of carbon dioxide removed from the air through photosynthesis .
A bit sad really.
I would love to know the results of a similar study with other plants and groundcovers instead of ornamental turf grass. I suspect that without all the inputs it would be a different story.
This does not devalue parks and gardens, however because we need them for our sanity.
The study included emissions from producing fertilizer, from mowing with gasoline-powered equipment and from pumping water to irrigate the plots. The pumped water was recycled — but if it were fresh water transported from distant rivers, as is much of Southern California water, emissions would be higher and they also factored in the nitrous oxide released from soil after fertilization. Nitrous oxide is a greenhouse gas 300 times more powerful than carbon dioxide.
Stephanie Pincetl, author of “Transforming California: A Political History of Land Use and Development.” praised the value of trees and recommended irrigating them because they reduce the heat island effect, but said “lawns have no such benefits, and also contribute to water pollution because they are heavily fertilized.”
Using rakes rather than leaf-blowers, and hand mowers rather than gasoline-powered equipment, would improve lawns’ carbon footprint.
They also commented that “about 40% of the drinking water we import at great financial and environmental expense is used for outdoor irrigation.”
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