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This is the VOA Special English Development Report.
Green roofs are designed to save energy and capture rainwater. Rooftops covered with plants help keep buildings cool. They can extend the life of a roof. And they can reduce water runoff into streets and storm water systems.
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| Chicago City Hall |
In Canada, the Coast Plaza Hotel in Vancouver has a ________ on its roof.
Experts say green roofs usually do not get much above twenty-seven degrees Celsius. So ________ ________ ________ be a problem for growing. But rooftop gardeners have to be careful not to put too much weight on the roof. This is true ________ ________ ________ ________ ________ ________ ________ ________.
New York City has an ________ ________ farm for hydroponics. The farm is on a boat called the Science Barge. ________ and ________ river water are used to grow ________, ________, ________ and ________. The farm shows the possibilities for ________ ________ ________.
Earlier this year, researchers in Texas reported that green roofs can ________ a building's air ________ costs by about one-fifth ________ to black-top roofs. But they also reported that not all green roofs ________ ________ well. They found that designs ________ in their ability to ________ ________ ________ and to ________ ________.
Mark Simmons led the study for the Lady Bird Johnson Wildflower Center at the University of Texas at Austin. "Green roofs have to be done right," he says. For example, he says, "Just having a green roof may not mean anything in terms of ________ ________ ________ ________ the street level."
The team put ________ roofs on top of ________ ________boxes, to________ green roof conditions. The study compared products from six companies. The researchers say they want to help businesses ________ ________ to ________ their designs.
Each rooftop had ________ different kinds of plants native to Texas. The researchers say the presence of native plants likely helped all the green roofs capture water better compared to sedums. Sedums are plants that need little water and often are used on green roofs.
The native plants could take in more water and ________ more of it to the ________.
And that's the VOA Special English Development Report, written by Jerilyn Watson.
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