20 Reasons Why Forests Are Important

Forests cover nearly a third of all land on Earth, providing vital organic infrastructure for some of the planet’s densest, most diverse collections of life. They support countless species, yet humans clear millions of acres from natural forests every year, especially in the tropics, letting deforestation threaten some of Earth’s most valuable ecosystems.

We tend to take forests for granted, underestimating how indispensable they are for everyone on the planet. That would quickly change if all the forests on Earth disappeared, but since humanity might not survive that scenario, the lesson wouldn’t be useful then.

Indifference, in turn, often depends on ignorance. So to help the situation get better for woodlands around the world, we’d all be wise to learn more about the benefits of forests — and to share that knowledge with others. In hopes of shedding more light on why forests are so important, and how little we can afford to lose them, here are 20 things forests do for us.

1. Help Us Breathe

Forests pump out the oxygen we need to live and absorb the carbon dioxide we exhale (emit). A single mature, leafy tree is estimated to produce a day’s supply of oxygen for anywhere from two to 10 people. Phytoplankton in the ocean are more prolific, providing half of Earth’s oxygen, but forests are still a key source of quality air.

2. Home to Nearly Half of All Species

Nearly half of Earth’s known species live in forests, including nearly 80% of biodiversity on land. That variety is especially rich in tropical rainforests, but forests around the planet teem with life; insects and worms work nutrients into soil, bees and birds spread pollen and seeds, and keystone species like wolves and big cats keep hungry herbivores in check. Biodiversity is a big deal for ecosystems and human economies, yet it’s increasingly threatened around the world by deforestation.

3. Benefit Millions of Humans

Some 300 million people live in forests worldwide, including an estimated 60 million indigenous people whose survival depends almost entirely on native woodlands. Many millions more live along or near forest fringes, but even just a scattering of urban trees can provide benefits to humans, such as increased property values and reduced crime.

4. Keep Us Cool

By growing a canopy to hog sunlight, trees also create vital oases of shade on the ground. Urban trees help buildings stay cool, reducing the need for electric fans or air conditioners, while large forests tackle daunting tasks like curbing a city’s “heat island” effect or regulating regional temperatures.

5. Keep Earth Cool

Trees also have another way to beat the heat—absorb CO2 that fuels global warming. Plants always need some CO2 for photosynthesis, but Earth’s air is now so thick with extra emissions that forests fight global warming just by breathing. CO2 is stored in wood, leaves, and soil, often for centuries.

6. Make It Rain

Large forests can influence regional weather patterns and even create their own microclimates. The Amazon rainforest, for example, generates atmospheric conditions that not only promote regular rainfall in that forest and nearby farmland but potentially as far away as the Great Plains of North America.

7. Prevent Flooding

Tree roots are our allies in heavy rainfall, especially when it rains in low-lying areas like river plains. They help the ground absorb more of a flash flood, reducing soil loss and property damage by slowing the flow.

8. Soak Up Runoff, Protecting Other Ecosystems

In addition to controlling flooding, trees’ ability to soak up surface runoff also protects ecosystems downstream. Modern stormwater increasingly carries toxic chemicals, from gasoline and lawn fertilizer to pesticides and pig manure, that accumulate through watersheds and eventually create low-oxygen “dead zones.”

9. Refill Aquifers

Forests are like giant sponges, catching runoff rather than letting it roll across the surface. But they can’t absorb all of it. Water that gets past their roots trickles down into aquifers, replenishing groundwater supplies that are important for drinking, sanitation, and irrigation around the world.

10. Block Wind

Farming near a forest provides many benefits, such as bats and songbirds who come out of their forest home to eat insects that threaten crops. Owls and foxes that live in forests also often venture out to eat rats on farms. But forests can also serve as a windbreak for farmers, providing a buffer for wind-sensitive fruits and vegetables. And beyond protecting those plants from the wind itself, forests’ ability to block wind makes it easier for bees to pollinate the crops.

11. Keep Dirt in Its Place

A forest’s root network stabilizes huge amounts of soil, bracing the entire ecosystem’s foundation against erosion by wind or water. Not only does deforestation disrupt all that, but the ensuing soil erosion can trigger new, life-threatening problems like landslides and dust storms.

12. Clean Up Dirty Soil

In addition to holding soil in place, forests may also use phytoremediation to clean out certain pollutants. Trees can either sequester the toxins away or degrade them to be less dangerous. This is a helpful skill, letting trees absorb sewage overflows, roadside spills or contaminated runoff.

13. Clean Up Dirty Air

Forests can clean up air pollution on a large scale, and not just CO2. Trees absorb a wide range of airborne pollutants, including carbon monoxide, sulfur dioxide and nitrogen dioxide. In the U.S. alone, urban trees are estimated to save 850 lives per year and $6.8 billion in total health care costs just by removing pollutants from the air.

14. Muffle Noise Pollution

Sound fades in forests, making trees a popular natural noise barrier. The muffling effect is largely due to rustling leaves — plus other woodland white noise, like bird songs — and just a few well-placed trees can cut background sound by 5 to 10 decibels, or about 50% as heard by human ears.

15. Feed Us

Not only do trees produce fruits, nuts, seeds and sap, but they also enable a cornucopia near the forest floor, from edible mushrooms, berries and beetles to larger game like deer, turkeys, rabbits and fish.

16. Help Us Make Things

Where would humans be without timber and resin? We’ve long used these renewable resources to make everything from paper and furniture to homes and clothing, but we also have a history of getting carried away, leading to overuse and deforestation. Thanks to the growth of tree farming and sustainable forestry, though, it’s becoming easier to find responsibly sourced tree products.

17. Create Jobs

More than 1.6 billion people rely on forests to some extent for their livelihoods, according to the U.N., and 10 million are directly employed in forest management or conservation. Forests contribute about 1% of the global gross domestic product through timber production and non-timber products, the latter of which alone support up to 80% of the population in many developing countries.

18. Create Majesty

Natural beauty may be the most obvious and yet least tangible benefit a forest offers. The abstract blend of shade, greenery, activity and tranquility can yield concrete advantages for people, however, like convincing us to appreciate and preserve old-growth forests for future generations.

19. Help Us Explore and Relax

Our innate attraction to forests, part of a phenomenon known as biophilia, is still in the relatively early stages of scientific explanation. We know biophilia draws us to woods and other natural scenery, though, encouraging us to rejuvenate ourselves by exploring, wandering or just unwinding in the wilderness. They give us a sense of mystery and wonder, evoking the kinds of wild frontiers that molded our distant ancestors. And thanks to our growing awareness that spending time in forests is good for our health, many people now seek out those benefits with the Japanese practice of shinrin-yoku, commonly translated to English as “forest bathing.”

20. Are Pillars of Their Communities

Like the famous rug in “The Big Lebowski,” forests really tie everything together — and we often don’t appreciate them until they’re gone. Beyond all their specific ecological perks (which can’t even fit in a list this long), they’ve reigned for eons as Earth’s most successful setting for life on land. Our species probably couldn’t live without them, but it’s up to us to make sure we never have to try. The more we enjoy and understand forests, the less likely we are to miss them for the trees.