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Urban trees are good for people and wildlife. They keep us healthy and make us happy.
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Director, Public Lands Campaign, Environment America Research & Policy Center
Conservation intern
When people think of trees, they tend to think of vast forests far away from the commotion of a city. These forests are important for biodiversity, carbon sequestration and clean water, but trees in our cities and suburbs also serve an important purpose. Urban trees clean our air, lower temperatures and even save money.
Cities tend to have higher temperatures, more greenhouse gas emissions, worse air quality and more noise pollution than rural and wild areas. Planting trees in parks, along sidewalks, on corporate campuses or in private yards can help address these problems.
Trees absorb carbon dioxide and other harmful pollutants from the air, reducing human exposure to them. Unfortunately, trees are also harmed by some of these pollutants so the best way forward is to reduce emissions from cars, trucks and power plants. In the meantime, trees can help mitigate some of the health effects of air pollution.
Urban areas that are lacking trees often have less shade and evaporation, which can lead to heat islands. Trees can create a more habitable and enjoyable local climate with more moisture, cooler temperatures and buffered wind. This will be increasingly important as extreme heat becomes more common due to climate change.
Trees can reduce toxic runoff and reduce flooding by catching rain in their leaves and stopping it from reaching the ground and by their roots soaking up rain and pushing it back into the atmosphere. Both of these functions limit the amount of water running over polluted urban surfaces and being pumped directly into streams. Trees also remove chemicals from polluted water.
Urban trees and forests are especially important for birds whose population numbers have plummeted since 1970.
Environmental benefits are not the only reasons why urban trees should be valued. Trees make communities more livable for residents by adding natural beauty, improving mental health and providing spaces for solitude and privacy.
Increasing urban trees in cities has the potential to make the lives of future generations more enjoyable and counter the effects of climate change.
Ellen runs campaigns to protect America's beautiful places, from local beachfronts to remote mountain peaks. She sits on the Steering Committee of the Arctic Defense Campaign and co-coordinates the Climate Forests Campaign. Ellen previously worked as the organizing director for Environment America’s Climate Defenders campaign and managed grassroots campaign offices across the country. Ellen lives in Denver, where she likes to hike in Colorado's mountains.
Conservation intern