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Deforestation 101: What It Is, Why It Happens & Why It's So Harmful

Emma Loewe
mbg Sustainability + Health Director By Emma Loewe
mbg Sustainability + Health Director
Emma Loewe is the Senior Sustainability Editor at mindbodygreen and the author of "Return to Nature: The New Science of How Natural Landscapes Restore Us."
You Know Deforestation Is Bad — But Do You Know Why? Here's A Primer
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When you hear about the massive tree-planting efforts happening around the world, it's easy to forget just how harmful deforestation can be. Who cares if we lose a tree if we go on to plant one, or even two, in its place, right? Wrong! This mentality doesn't account for the major threat that deforestation plays to human, animal, and ecosystem health.

Here's an overview of why deforestation is so harmful, what can be done about it, and why it happens in the first place.

What is deforestation?

Deforestation is the process of clearing forested lands, often to make way for human industries like agriculture, transportation, or fossil fuel extraction.

Annika Terrana, a forest director at the World Wildlife Fund (WWF), tells mindbodygreen that at the current rate of deforestation, "we're losing about 30 soccer fields' worth of forest a minute."

Most of this is occurring in 24 key regions, which the WWF calls "deforestation fronts." "Those are areas of forests across the tropics and subtropics of Latin America, sub-Saharan Africa, Southeast Asia, and Oceania," Terrana explains.

Deforestation can occur on primary forests (old growth that has never been significantly altered) as well as secondary forests (which have been cleared before and regrown). While both types of forests are essential to conserve for reasons we'll get to later, primary forests are usually considered the most ecologically valuable.

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What causes deforestation?

The drivers of deforestation will differ depending on where in the world you look. Terrana explains that while many forests in the Congo Basin are being cut for roads and railways, for example, forests in Southeast Asia are largely cleared to make way for palm oil production.

It's difficult to keep people from cutting down forests since they typically make money doing so. Take the Amazon rainforest as an example: Liana Anderson, Ph.D., a biologist who studies climate extremes in the region, explains that the deforestation rates in the Amazon rose dramatically at the turn of the century as more farmers cleared forest land to grow and feed cattle that they then went on to sell.

By 2005, a suite of policies was in place to protect the forest, successfully reducing deforestation by rates of up to 37% per year. However, Anderson notes, "We failed to enforce these laws. We failed dramatically." These environmental policies had steadily been weakened in the years leading up to the massive 2019 fires in the region—most of which were intentionally set by farmers and loggers to clear land for growing crops and other commodities. Anderson says that deforestation continues to be a huge concern in the Amazon, exacerbated by practices like land grabbing (private companies claiming ownership of public land for development).

Forestlands tend to be very fertile, making them prime spots for growing. Clearing them can cause economic gain in the short term, but it comes at a dangerous long-term cost.

Negative effects of deforestation.

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Clearly, there are no easy solutions here. To solve this problem, we'll need to fundamentally reimagine the way we value land. "On the whole," Terrana says of the issue, "the way we produce and consume globally isn't sustainable at a large scale." Here's a look at some of the ways that deforestation negatively affects people and communities around the world:

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1. It harms the people who rely on forests.

Around 1.6 billion people around the world depend on forests for their livelihoods. As WWF explores in its new report, The Vitality of Forests, deforestation can harm these people by reducing their access to food, shelter, shade, and plant medicine.

Indigenous populations, who have lived in a reciprocal relationship with the forest for hundreds of years, are often hit hardest. "Indigenous peoples are quite literally on the front lines of some of this deforestation, and they're not the ones who are perpetuating it," Terrana adds.

2. It turns up the dial on climate change.

Forests—particularly primary forests—are an essential tool for mitigating climate change. As trees grow older, they absorb more and more carbon from the atmosphere and store it in their trunks and root systems. Once they're cut down, that carbon gets released back into the atmosphere, where it contributes to global warming. For this reason, the UN has declared that "Stopping deforestation and restoring damaged forests, together with other land-based actions, could provide up to 30% of the climate solution."

And carbon isn't the only thing that trees can gobble up as they grow: Forests help remove other pollutants from our air and water too.

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3. It threatens biodiversity.

Deforestation also displaces some of our planet's most spectacular wildlife. Deforestation hot spot Sumatra, for example, is "the last place in the world where you have orangutans, tigers, and elephants all living together," says Terrana. Destroying primary forest habitats like those in Sumatra threatens the survival of these species and many others. And since everything in nature is dependent on one another, disrupting one species will ultimately disrupt everything around it.

4. It throws off rainfall and weather patterns.

Anderson calls the Amazon one of the most "precious resources that we have in Brazil"—not just because of its beauty but because of its ability to regulate temperature and humidity. The rainforest promotes rainfall throughout South America. Research shows that deforestation (paired with climate change) now seems to be contributing to historic droughts in regions like São Paulo. "My view is that the amount of deforestation that we have so far is already affecting the hydrological cycle," Anderson says.

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5. It increases wildfire risk.

If trees provide shade and water, it makes sense that chopping them down would lead to hot, dry conditions—the type that are ideal for wildfires. Uncontrolled wildfires are obviously harmful to forest communities, but their danger spreads even further than that. "It has been suggested that the fires associated with deforestation in the Amazon are responsible for over 2,000 deaths in South America per year," Anderson explains, due to increased exposure to air pollution.

6. It destroys beloved landscapes—often beyond repair.

Think back to the last time you visited an established, undisturbed forest. The smell of the bark and damp earth, the feel of the cool air on your skin, the sounds of the canopy rustling overhead likely left you feeling calm and invigorated, right? Spending time in the woods is a treat for the senses (and potentially our immune strength) that I, for one, can't imagine losing.

And while you can plant new trees to take on some of the qualities of ancient ones, it will take decades (if not centuries) for these saplings to get established. That's because when we destroy a tree, we also destroy the intricate underground fungal networks that the tree uses to send resources back and forth to its neighbors. We're learning more about these networks (nicknamed, the "woodwide web") all the time, and ongoing research reveals just how fascinating and fragile they are.

A team out of the University of British Columbia, spearheaded by Suzanne Simard, Ph.D., is even suggesting that the network's oldest trees take on maternal qualities over time: They transfer nutrients to young trees in need and protect their kin from threats. These are the mother of all trees, and they're well worth protecting.

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What can be done?

As the Amazon example proves, reducing deforestation will require governments, corporations, and local communities to come together and agree on binding policy changes. However, Terrana notes, there are ways that individuals like you and me can use our purchasing and political power to help move the process along. Here are a few:

  • Buy less and buy better: Commodities like beef, soy, palm oil, and wood products drive the majority of the deforestation around the world. However, Terrana notes that even if the demand for these things disappeared overnight, something else would quickly take their place. This means that it's important to be a conscious consumer with every purchase you make and question where all your goods come from, how they were made, and whether you really need them.
  • Shop FSC-certified wood products: The Forest Stewardship Council (FSC) certification is currently the leading forest certification scheme, and it verifies that a wood product didn't contribute to deforestation or human rights abuses. You can find the FSC logo (it's the outline of a little tree that becomes a checkmark) on everything from guitars to notebooks. Terrana recommends buying FSC-certified goods when you can and asking companies that don't have the logo if they'd consider becoming certified. This sends a signal to brands that forest protection is important to consumers.
  • Shop RSPO-certified palm oil: The Roundtable on Sustainable Palm Oil (RSPO) certification designates sustainable palm oil that didn't contribute to deforestation. Terrana notes that this logo is not as prevalent as FSC's, but you can still find it on a number of food and personal care products made using palm oil.
  • Look beyond restoration: You've probably heard of businesses and governments funding tree plantings to offset their carbon emissions. While planting trees certainly isn't a bad thing (unless it's done incorrectly), it shouldn't get anyone off the hook for harming intact forests. If a brand funds tree plantings after growing products on deforested land, that's a textbook example of greenwashing. Keep this in mind as you're looking for companies and policies to support: In addition to creating new forests, we really need to conserve the ones we already have.
  • Reach out to your representatives: Live in the U.S.? Where does your representative stand on The Forest Act—federal legislation that would help prevent illegally deforested products from entering the country? If deforestation is something you care about, write to your governing bodies to let them know you support policies like these.
  • Keep learning, supporting, and sharing: Finally, you can stay on top of news about deforestation with platforms like Mongabay and Global Forest Watch, donate to groups protecting forests like Amazon Watch, and continue sharing and discussing this topic with your community.

The bottom line.

We're losing far too much valuable forest land to deforestation every day. This is one environmental problem with no easy solution, but we can all play a part in slowing it by making smart purchasing decisions, supporting groups doing good work, and continuing learning and talking about the issue all the time—not just when it's in the news.

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