1) Safety. Keep trees pruned, trimmed and always look for signs of stress on branches or irregularities in the bark. Damage caused by falling branches and trees can not only cause costly property damage, they can also be dangerous to you and your family.
2) Saves you money on heating/cooling costs. Trees can have an impact on the energy used for heating and cooling a building, reducing air conditioning costs by as much as 30 percent and saving 20 to 50 percent on energy for heating.
3) Makes you money on property value. Trees near buildings can raise property prices by as much as up to 37 percent.
4) Healthy trees are good for breathing. A single 30-meter-tall mature tree can absorb as much as 50 pounds of carbon dioxide in a year, which over its lifetime is approximately the same amount as would be produced by an average car being driven 25,787 miles.
5) Trees prevent crime. From 2005 to 2007, the U.S. Forest Service studied the correlation of crime and the presence of trees in Portland, Oregon. They found that areas with larger trees experienced less crime than those with smaller ones. The study concluded that trees serve as a symbolic safety net. Neighborhoods and houses with large trees are assumed to be better kept and protected than those without them. Furthermore, they speculated that smaller trees provide better cover for criminals seeking to sneak up on a residence.
6) Trees are natural humidifiers. In one day, one large tree can lift up to 100 gallons of water out of the ground and discharge it into the air.
7) Trees shield children from ultra-violet rays. Skin cancer is the most common form of cancer in the United States. Trees reduce UV-B exposure by about 50 percent, thus providing protection to children on school campuses and playgrounds – where children spend hours outdoors.
8) Trees combat climate change. Excess carbon dioxide (CO2) caused by many factors is a building up in our atmosphere and contributing to climate change. Trees absorb CO2, removing and storing the carbon while releasing the oxygen back into the air. In one year, an acre of mature trees absorbs the amount of CO2 produced when you drive your car 26,000 miles.
9) Trees save water. Shade from trees slows water evaporation from thirsty lawns. Most newly planted trees need only fifteen gallons of water a week. As trees transpire, they increase atmospheric moisture.
10) Trees help prevent soil erosion. On hillsides or stream slopes, trees slow runoff and hold soil in place.
BONUS: Venice wouldn’t exist. The Venice Islands in Italy were built on a foundation of tree trunks and 1200 years later, those same trunks still support almost all of central Venice. They will stay there for thousands of years more as long as they stay submerged. Because they are not exposed to oxygen, they do not rot. They actually have begun to petrify due to the mineral rich water. So in another thousand years, they will actually become stone pilings.