標準環境・自然科学語句空所補充

Cooling Cities with Trees

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Summers in big cities are getting hotter every year. Concrete buildings and roads heat during the day and it at night, so the air stays . To with this, the city of Greenport decided to ( 1 ). Workers planted thousands of trees along streets and in empty lots. The results were clear. Areas with many trees were several degrees cooler than areas without them. ( 2 ), the trees gave shade to people walking outside and homes to birds and insects. Residents said the streets felt more . The was not without challenges. Young trees need water and , ( 3 ) the city had to volunteers to look after them. Still, officials believe the is it, and other cities are now studying Greenport's .

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