Trees Are Tree - rific ! Look at the picture of a forest and imagine that youare taking a walk through it . Can you feel the breeze and smell the fresh scent of the trees and the leaves ? We get so many gifts from nature ! Many people are aware that spending time in nature can help them feel relaxed . Trees Can Reduce Stress and Make Us Happier ! Now , there is scientific evidence that nature actually has healing effects . According to some studies , forests can reduce stress and anger as well as improve your mood and overall happiness . Other studies have shown that after stressful situations , people recover faster in natural environment than in man - made ones . In particular , blood pressure , heart rate , muscle tension , and stress level decrease faster in natural settings . A recent study has shown that a simple walk in thewoods can bring about positive cognitive and emotional changes . Sixty college students in their twenties ( 35 males and 25 females ) participated in the study . They were divided into two groups . Both groups took a walk for about 50 minutes , but one group took a walk in the woods and the other in the city . Their cognitive abilities and emotional levels were measured after they returned to the lab . The cognitive abilities of the participants who walked in the woods improved more than 20 %. Their emotions such as depression , anger , and fatigue were replaced by positive emotions , such as happiness . On the other hand , the cognitive abilities of the participants in the city group actually worsened , and they experienced more negative emotions . " Trees are a luxury for all of us , and we need this luxury for our health , mind , and soul . Places become sad when there is no green , no life present . Trees balance our lives . "- Karin Leitner , classical musicianTrees at Work in the CityMany cities are working hard to expand areas where trees can be planted . This is due to the belief that trees can improve both the environment and the quality of life . Here are some ways trees help us . Keep it DownNoise pollution is everywhere , and unpleasant noise negatively affects us . In noisy areas such as near airports and train stations , trees can absorb sound and reduce noise almost as effectively as stone walls . Stay Cool and WarmThe tree branches provide shaded areas where people can cool off during summer . Trees can also help reduce heating costs during winter by breaking the force of winter winds . Trees can reduce the annual energy use around buildings by as much as 10 %. A Natural Air FilterTrees can absorb and lock in carbon dioxide , keeping it from harming the environment . In fact , a large tree can provide enough oxygen for ten people . In addition , it traps dust and pollutants in its leaves . Trees have a positive impact on air quality , and help reduce stress - related illnesses . A Defense Against Natural DisastersThe top layers of soil can be carried away by wind and water , and this can later cause floods and clog waterways . The strong roots of trees hold soil in place . A Defense Against CrimeTrees can help reduce crime , too . A charity in the London Borough of Tower Hamlets has been planting trees along the street . The trees have made the street look pleasant , appealing , and less threatening . Residents now use the street much more than before , so they feel safer on the street . As one resident says , " By planting trees along the street , they gave the street back to the community . " Trees in the cities are on the job around the clock every day , working for all of us . They help us live in a much more comfortable environment . They also keep us safe from natural disasters and help us create a stronger bond with our communities . They work to make our urban environment a better place even when we are fast asleep .