If you are looking for a reason to worry about the loss of a tree, the heat waves that record summer records can be. Trees can reduce daytime temperatures in summer by 10 degrees Fahrenheit, according to a recent study.
But tree coverage in US cities is declining. A study published last year by the US Forest Service found that we lose 36 million trees annually in urban and rural communities over a five-year period. That is a 1% decrease from 2009 to 2014.
If we continue on this path only then, "cities will be warmer, more polluted and healthier " said David Nowak, a senior US Forest Service scientist and author of the study.
Nowak explains that there are many reasons for the decline in our tree, including hurricanes, hurricanes, fires, insects and diseases. But one reason for the loss of a tree that people can control is logical development.
"We see the tree cover being replaced without an inaccessible cover, which means that if we look at the pictures, the existing one has now been replaced by a parking lot or a building," Nowak said.
More than 80% of Americans live in urban areas, and most Americans live in forested regions along the East and West coasts, Noah said.
"Every time we put a road down, we erect a building and cut down a tree or put a tree in it, it not only touches that site, it also affects the district."
The total loss was $ 96 million a year.
Nowak lists ten benefits that trees provide to the community:
Reduce heat: Trees provide shade for homes, office buildings, parks and roads, cooling temperatures above. They also absorb and evaporate water, cooling the air around them. "Just walk in the shade of a tree on a hot day. You can't find that in the grass," Nowak said. To get the full benefit of temperature, a tree bed cover should exceed 40% of the area to be cooled, according to a recent study in Proceedings of the National Academy of Sciences. "One city that will need to be almost completely lined with a series of green leaves and green leaves," the authors wrote.
Reducing air pollution: Trees absorb carbon and remove pollutants from the atmosphere.
Reducing energy emissions: Trees reduce energy costs by $ 4 billion a year, according to a study by Nowak. "Sharing these trees in buildings reduces your ventilation costs. Remove those trees; now your buildings are hot, you use too much air conditioning, and you burn a lot of fuel in power plants, so pollution and pollution increase."
Water quality improvement: Trees act as water filters, absorbing more contaminated water and absorbing nitrogen and phosphorus from the soil.
Reducing flooding: Trees reduce flooding by absorbing water and reducing the flow of streams.
Noise reduction: Trees can distort noise, one of the reasons you will see them along highways, by fences and between roads and neighborhoods. They can also add sound to birds chirping and wind blowing through the leaves, sounds that have shown psychological benefits.
UV radiation: Trees absorb 96% of ultraviolet radiation, Nowak said.
Improved aesthetics: Ask any real estate agent, architect or city planner: Trees and leaf cover enhances the look and value of any property.
Improved human health: Many studies have found a link between exposure to the environment and better mental and physical health. Some hospitals have increased tree viewing and patient planting as a result of these studies. Doctors have even ruled out the natural movement of children and families because of the evidence that natural exposure lowers blood pressure and stress hormones. And studies have linked living near green areas with lower mortality rates.
Wildlife habitat: Birds rely on trees for shelter, food, and nesting. All over the world, forests provide many species of animals.
Noahak notes that there are disturbances in the trees and, such as pollen allergies or large branches that fall when there are storms, "and people do not like to clear the leaves." However, he says, there are ways in which cities and districts can manage trees to help communities thrive. "You can't just say 'we can't have forests.' We can manage and work with trees. "
"You don't want a tree in the middle of a baseball field. It's very difficult to play games if you have trees on the road. Or the trees are in the middle of the highway."
Nowak says we can design and manage tree canopies in our cities to help "touch the air, touch the water, and touch our well-being."
Urban forests in particular need our help to replace fallen trees. Unlike rural areas, it is very difficult for trees to reproduce in an area with a rocky and asphalt city.
"Many of our indigenous trees can't find a place to cast an acorn for regeneration," explains Greg Levine, co-executive director of Trrees Atlanta.
"That's why the community has to come in and plant a tree because these areas are no longer natural."
The work is not complete when the seedlings grow. Organizations such as Trees Atlanta and their volunteers plan most of their year to care for these young trees until they are mature enough to grow on their own.
"We are trying to prune the trees for ten years to ensure they get a good healthy structure." Levine adds. "We also install a river cover around the trees to help retain moisture in the soil so that the tree does not dry out. We have to be very patient by planting trees around the tractor, making sure they can withstand the challenge."