Have you ever heard of “green roofs”?
They are roofs of buildings that are covered with plants.
Green roofs are becoming popular / especially in large cities / because they are good for the environment. // In summer, / cities are often hotter / than other areas. // Green roofs keep buildings cool / ①( without ) electricity. // These buildings produce less CO2 / because they do not use much air conditioning. // Furthermore, / plants on the roofs / take in CO2. //
Green roofs may sound new, but actually they have a long history. In Norway, farmhouses have had grass roofs for centuries. In Japan, people have had straw-roof houses ②( for ) thousands of years. These traditional roofs show ancient people’s wisdom.
In many cities, the natural environment has been replaced ③( by ) buildings. Green roofs may be an effective way for people in cities to live in harmony with nature.
Green roofs are becoming popular / especially in large cities / because they are good for the environment. // In summer, / cities are often hotter / than other areas. // Green roofs keep buildings cool / ①( without ) electricity. // These buildings produce less CO2 / because they do not use much air conditioning. // Furthermore, / plants on the roofs / take in CO2. //
Green roofs may sound new, but actually they have a long history. In Norway, farmhouses have had grass roofs for centuries. In Japan, people have had straw-roof houses ②( for ) thousands of years. These traditional roofs show ancient people’s wisdom.
In many cities, the natural environment has been replaced ③( by ) buildings. Green roofs may be an effective way for people in cities to live in harmony with nature.