>Scholar Hopes to Cool City By Covering Roofs With Greenery

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As Hong Kong struggles to build an environmentally friendly city, one professor is studying ways to help cut carbon emissions and lower electricity usage by covering the city’s rooftops with plants.
Jim Chi Yung, a geography professor at the University of Hong Kong, set up his first green roof in 2006 on top of one of the buildings at the university. He wanted to research how plants and grass covering a roof affect heating and cooling.
Variety of plants
The roof was divided into four parcels: one is bare concrete, and three others are covered with different plants. The first is grass, the second, a perennial that produces yellow flowers and the third, a shrub.
“So far I have been able to figure out quite a significant difference between the three vegetation type in terms of ecological and environmental benefits,” Jim said.
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