They reduce surface runoff of water. This can reduce soil erosion and pollution runoff into water resources. They reduce sedimentation in streams. Trees cool the air and add moisture to it. They lower the ambient air temperature.
Trees can impact noise level reduction by up to sixty percent .
Trees can impact our personal health. Research has shown that patients viewing landscaped areas spend less time in the hospital recuperating than patients without a landscaped view. Trees impact our emotional and psychological well being too. They convey a sense of peace to the viewer. Trees also have significant economic value.