The steel from old cars can be re-melted and made into new cars. All we have to do is think. Tree Loss Trees are as important to human beings as food and water are. One tree can clean toxic emissions from the dirty air exhausted from an average car being driven 4,000 miles. Trees produce most of the oxygen on Earth.
Trees keep our air breathable by removing carbon dioxide and pollutants.
They add moisture through transpiration . Trees reduce costs of using our resources. For example, shade trees save money and energy. Trees conserve other resources. Forests hold soil in place.