Planting trees is one method of making up for the depletion of natural forests, and by evaporative cooling and limiting the quantity of sunlight that reaches parking lots and buildings, trees lessen the impact of the urban heat island. Trees can also improve the quality of the air we breathe by removing dangerous dust and pollutants like ozone, carbon monoxide, and sulfur dioxide. To get involved, you can contact nonprofit organizations involved in planting trees, and begin volunteering in local gardens.