These findings gave real-world support for the results of previous, more theoretical work. Unexpectedly, when trees sat on a house's north side, electric bills went up. The result might be a statistical anomaly, Donovan said. But he speculated that blocked breezes or the need for more lighting could also explain the finding. Over a 100-year period, the scientists calculated, planting a London pine tree on the west side of a Sacramento home could reduce the house's net carbon use by 30 percent -- half through sequestering by the tree and half through reduced electricity use. Financial savings will increase, Donovan added, as utility companies start charging more for electricity at peak times of day. It's probably worth planting trees around your home, agreed Jim Simpson, a meteorologist at the Center for Urban Forest Research in Davis, Calif., despite the costs of buying trees and taking care of them. But the specifics of which trees to plant and where to plant them will likely differ in places that are colder, wetter, or otherwise different from the steaming valleys of California. "In the Sacramento area, air conditioning is a fairly big thing, and we have mild winters," Simpson told Discovery News. "It would be a good idea to do this sort of study in other climate zones where heating is a bigger deal." Related Links: |
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