26 Look for areas with space for large tree species The “heat island” effect diminishes if several trees are planted near one another, shading each other Groups of trees may grow larger and live longer than single ones in a landscape, providing cleaner air and water and a delightful space for generations Thousands of acres of DC land should be reforested to help the city comply with federal water and air laws (see page 20) The added forest will soak up atmospheric carbon dioxide, a key greenhouse gas, helping the city adapt to climate change 48 Satellite imagery can help private citizens and city officials find land that is available for trees Such imagery shows “pervious” surface areas where trees can be planted as well as “impervious” areas that are not now plantable Imagery comparisons can measure the forest acreage lost due to development Fig. 42 (below) Volunteers plant six trees to create new forest in the “parking” land on the edge of the forest of Rock Creek Park. Fig. 41 (right) Increasingly, the city is removing concrete “heat islands” such as this one, next to 1913 Mass, so the space may be planted with trees. Step 5: Expand the urban forest
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