You can find them in urban cities (like the ones I have visited), forests, deserts, savannas and even in the arctic tundra. In Madrid, Toledo and Barcelona, I have seen them in parks and on sidewalks. In Salamanca, I saw them near bridges and in a roundabout, too.
To survive, trees use the process of photosynthesis. Photosynthesis is the process by which plants (like trees) use the sun's energy and carbon dioxide from the air to make the food that they need to survive. Trees also use nutrients and water found in the soil for food.
Did you know that one tree can make about 260 pounds of oxygen each year? That is why trees can be called the lungs of the Earth. They help make fresh air by taking in carbon dioxide and pollutants through their leaves. Then the trees release the clean oxygen back to us. Not only do trees need the environment to survive, but we need them as well!
Tree fungi are one of the most harmful things for trees. There are various fungi that affect different kinds of trees. These fungi attach to trees and eat up all of the tree's nutrients. Luckily, this does not usually kill the trees, so trees can live to be 100 years old or even more!
In addition to fungi, humans also have a great impact on the lives of trees. Trees are natural resources that provide us with paper, pencils, oils, wood and make-up. Humans use these things often, so deforestation is becoming a problem. Humans also cut down trees to make space to build or to give space for animals to graze.
