RAINFOREST INFORMATION

A Place Out of Time: Tropical Rainforests and the Perils They Face - information on tropical forests, deforestation, and biodiversity

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BACKGROUND INFORMATION ON THE RAINFOREST

Rainforests are forest ecosystems characterized by high levels of rainfall, an enclosed canopy and high species diversity. While tropical rainforests are the best-known type of rainforest and the focus of this section of the web site, rainforests are actually found widely around the world, including temperate regions in Canada, the United States, and the former Soviet Union.

Tropical rainforests typically occur in the equatorial zone between the Tropic of Cancer and Tropic of Capricorn, latitudes that have warm temperatures and relatively constant year-round sunlight. Tropical rainforests merge into other types of forest depending on the altitude, latitude, and various soil, flooding, and climate conditions. These forest types form a mosaic of vegetation types which contribute to the incredible diversity of the tropics.

The bulk of the world's tropical rainforest occurs in the Amazon Basin in South America. The Congo Basin and Southeast Asia, respectively, have the second and third largest areas of tropical rainforest. Rainforests also exist on some the Caribbean islands, in Central America, in India, on scattered islands in the South Pacific, in Madagascar, in West and East Africa outside the Congo Basin, in Central America and Mexico, and in parts of South America outside the Amazon. Brazil has the largest extent of rainforest of any country on Earth.

Rainforests provide important ecological services, including storing hundreds of billions of tons of carbon, buffering against flood and drought, stabilizing soils, influencing rainfall patterns, and providing a home to wildlife and Indigenous people. Rainforests are also the source of many useful products upon which local communities depend.

While rainforests are critically important to humanity, they are rapidly being destroyed by human activities. The biggest cause of deforestation is conversion of forest land for agriculture. In the past subsistence agriculture was the primary driver of rainforest conversion, but today industrial agriculture — especially monoculture and livestock production — is the dominant driver of rainforest loss worldwide. Logging is the biggest cause of forest degradation and usually proceeds deforestation for agriculture.

Organization of this site

The rainforest section of Mongabay is divided into ten "chapters" (the original text for the site was a book, but has since been adapted for the web), with add-on content in the form of special focal sections (e.g. The Amazon, the Congo, REDD, New Guinea, Sulawesi, Forests in Brazil, etc), appendices, and other resources.

There is also a version of the site geared toward younger readers at kids.mongabay.com.

ABOUT THE RAINFOREST (SUMMARY)

RAINFOREST DISTRIBUTION AND CHARACTERISTICS

Each rainforest is unique, but there are certain features common to all tropical rainforests.

• Location: rainforests lie in the tropics.
• Rainfall: rainforests receive at least 80 inches (200 cm) of rain per year.
• Canopy: rainforests have a canopy, which is the layer of branches and leaves formed by closely spaced rainforest trees some 30 meters (100 feet) off the ground. A large proportion of the plants and animals in the rainforest live in the canopy.
• Biodiversity: rainforests have extraordinarily highs level of biological diversity or “biodiversity”. Scientists estimate that about half of Earth's terrestrial species live in rainforests.
• Ecosystem services: rainforests provide a critical ecosystem services at local, regional, and global scales, including producing oxygen (tropical forests are responsible for 25-30 percent of the world's oxygen turnover) and storing carbon (tropical forests store an estimated 229-247 billion tons of carbon) through photosynthesis; influencing precipitation patterns and weather; moderating flood and drought cycles; and facilitating nutrient cycling; among others.

The global distribution of tropical rainforests can be broken up into four biogeographical realms based roughly on four forested continental regions: the Afrotropical, the Australiasian, the Indomalayan/Asian, and the Neotropical. Just over half the world's rainforests lie in the Neotropical realm, roughly a quarter are in Africa, and a fifth in Asia.

These realms can be further divided into major tropical forest regions based on biodiversity hotspots, including:

1. Amazon: Includes parts of Bolivia, Brazil, Colombia, Ecuador, French Guiana, Guyana, Peru, Suriname, Venezuela
2. Congo: Includes parts of Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Republic of Congo
3. Australiasia: Includes parts of Australia, Indonesian half of New Guinea, Papua New Guinea
4. Sundaland: Includes parts of Brunei, Indonesia, Malaysia, Singapore
5. Indo-Burma: Includes parts of Bangladesh, Cambodia, China, India, Laos, Myanmar, Thailand, Vietnam
6. Mesoamerica: Includes parts of Belize, Costa Rica, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama
7. Wallacea: Sulawesi and the Maluku islands in Indonesia
8. West Africa: Includes parts of Benin, Cameroon, Côte d'Ivoire, Ghana, Guinea, Liberia, Nigeria, Sierra Leone, Togo
9. Atlantic forest: Includes parts of Argentina, Brazil, Paraguay
10. Choco: Includes parts of Colombia, Ecuador, Panama

Other countries that have large areas of rainforest include Bolivia, Cameroon, Central African Republic, Ecuador, Gabon, Guyana, India, Laos, Malaysia, Mexico, Myanmar, Papua New Guinea, Republic of Congo, Suriname, and Venezuela.

Cover and loss by rainforest region

RAINFOREST STRUCTURE

Rainforests are characterized by a unique vegetative structure consisting of several vertical layers including the overstory, canopy, understory, shrub layer, and ground level. The canopy refers to the dense ceiling of leaves and tree branches formed by closely spaced forest trees. The upper canopy is 100-130 feet above the forest floor, penetrated by scattered emergent trees, 130 feet or higher, that make up the level known as the overstory. Below the canopy ceiling are multiple leaf and branch levels known collectively as the understory. The lowest part of the understory, 5-20 feet (1.5-6 meters) above the floor, is known as the shrub layer, made up of shrubby plants and tree saplings.

RAINFOREST BIODIVERSITY

Tropical rainforests support the greatest diversity of living organisms on Earth. Although they cover less than 2 percent of Earth’s surface, rainforests house more than 50 percent of the plants and animals on the planet.

THE RAINFOREST CANOPY

In the rainforest most plant and animal life is not found on the forest floor, but in the leafy world known as the canopy. The canopy, which may be over 100 feet (30 m) above the ground, is made up of the overlapping branches and leaves of rainforest trees. Scientists estimate that more than half of life in the rainforest is found in the trees, making this the richest habitat for plant and animal life.

The conditions of the canopy are markedly different from the conditions of the forest floor. During the day, the canopy is drier and hotter than other parts of the forest, and the plants and animals that live there have adapted accordingly. For example, because the amount of leaves in the canopy can make it difficult to see more than a few feet, many canopy animals rely on loud calls or lyrical songs for communication. Gaps between trees mean that some canopy animals fly, glide, or jump to move about in the treetops. Meanwhile plants have evolved water-retention mechanisms like waxy leaves.

Scientists have long been interested in studying the canopy, but the height of trees made research difficult until recently. Today the canopy is commonly accessed using climbing gear, rope bridges, ladders, and towers. Researchers are even using model airplanes and quadcopters outfitted with special sensors — conservation drones — to study the canopy.

The rainforest floor

The rainforest floor is often dark and humid due to constant shade from the leaves of canopy trees. The canopy not only blocks out sunlight, but dampens wind and rain, and limits shrub growth.

Despite its constant shade, the ground floor of the rainforest is the site for important interactions and complex relationships. The forest floor is one of the principal sites of decomposition, a process paramount for the continuance of the forest as a whole. It provides support for trees responsible for the formation of the canopy and is also home to some of the rainforest's best-known species, including gorillas, tigers, tapirs, and elephants, among others.

Rainforest waters

Tropical rainforests support some of the largest rivers in the world, like the Amazon, Mekong, Negro, Orinoco, and Congo. These mega-rivers are fed by countless smaller tributaries, streams, and creeks. For example, the Amazon alone has some 1,100 tributaries, 17 of which are over 1,000 miles long. Although large tropical rivers are fairly uniform in appearance and water composition, their tributaries vary greatly.

Rainforest waters are home to a wealth of wildlife that is nearly as diverse as the biota on land. For example, more than 5,600 species of fish have been identified in the Amazon Basin alone.

But like rainforests, tropical ecosystems are also threatened. Dams, deforestation, channelization and dredging, pollution, mining, and overfishing are chief dangers.

Rainforest people

Tropical rainforests have long been home to tribal peoples who rely on their surroundings for food, shelter, and medicines. Today very few forest people live in traditional ways; most have been displaced by outside settlers, have been forced to give up their lifestyles by governments, or have chosen to adopt outside customs.

Of the remaining forest people, the Amazon supports the largest number of Indigenous people living in traditional ways, although these people, too, have been impacted by the modern world. Nonetheless, Indigenous peoples' knowledge of medicinal plants remains unmatched and they have a great understanding of the ecology of the Amazon rainforest.

In Africa there are native forest dwellers sometimes known as pygmies. The tallest of these people, also called the Mbuti, rarely exceed 5 feet in height. Their small size enables them to move about the forest more efficiently than taller people.

There are few forest peoples in Asia living in fully traditional ways. The last nomadic people in Borneo are thought to have settled in the late 2000's. New Guinea and the Andaman Islands are generally viewed as the last frontiers for forest people in Asia and the Pacific.

Deforestation

In recent decades there has been an important shift in deforestation trends. Today export-driven industries are driving a bigger share of deforestation than ever before, marking a shift from previous decades, when most tropical deforestation was the product of poor farmers trying to put food on the table for their families. There are important implications from this change. While companies have a greater capacity to chop down forests than small farmers, they are more sensitive to pressure from environmentalists. Thus in recent years, it has become easier—and more ethical—for green groups to go after corporations than after poor farmers.

Rainforests are also threatened by climate change, which is contributing to droughts in parts of the Amazon and Southeast Asia. Drought causes die-offs of trees and dries out leaf litter, increasing the risk of forest fires, which are often set by land developers, ranchers, plantation owners, and loggers.

Rainforest importance

While rainforests may seem like a distant concern, they are critically important for our well-being. Rainforests are often called the lungs of the planet for their role in absorbing carbon dioxide, a greenhouse gas, and producing oxygen, upon which all animals depend for survival. Rainforests also stabilize climate, house incredible amounts of plants and wildlife, and produce nourishing rainfall all around the planet.

Rainforests:

• Help stabilize the world’s climate: Rainforests help stabilize the world’s climate by absorbing carbon dioxide from the atmosphere. Scientists have shown that excess carbon dioxide in the atmosphere from human activities is contributing to climate change. Therefore, living rainforests have an important role in mitigating climate change, but when rainforests are chopped down and burned, the carbon stored in their wood and leaves is released into the atmosphere, contributing to climate change.
• Provide a home to many plants and animals: Rainforests are home to a large number of the world’s plant and animals species, including many endangered species. As forests are cut down, many species are doomed to extinction.
• Help maintain the water cycle: The role of rainforests in the water cycle is to add water to the atmosphere through the process of transpiration (in which plants release water from their leaves during photosynthesis). This moisture contributes to the formation of rain clouds, which release the water back onto the rainforest. In the Amazon, 50-80 percent of moisture remains in the ecosystem’s water cycle. When forests are cut down, less moisture goes into the atmosphere and rainfall declines, sometimes leading to drought. Rainforests also have a role in global weather patterns. For example researchers have shown that forests in South America affect rainfall in the United States, while forests in Southeast Asia influence rain patterns in southeastern Europe and China. Distant rainforests are therefore important to farmers everywhere.
• Protect against flood, drought, and erosion: Rainforests have been compared to natural sponges, moderating flood and drought cycles by slowing run-off and contributing moisture to the local atmosphere. Rainforests are also important in reducing soil erosion by anchoring the ground with their roots. When trees are cut down there is no longer anything to protect the ground, and soils are quickly washed away with rain. On steep hillsides, loss of forest can trigger landslides.
• Are a source for medicines and foods and support forest-dependent people: People have long used forests as a source of food, wood, medicine, and recreation. When forests are lost, they can no longer provide these resources. Instead people must find other places to get these goods and services. They also must find ways to pay for the things they once got for free from the forest.

Rainforest conservation

Rainforests are disappearing very quickly. The good news is there are a lot of people who want to save rainforests. The bad news is that saving rainforests will be a challenge as it means humanity will need to shift away from business-as-usual practices by developing new policies and economic measures to creative incentives for preserving forests as healthy and productive ecosystems.

Over the past decade there has been considerable progress on several conservation fronts. Policymakers and companies are increasingly valuing rainforests for the services they afford, setting aside large blocks of forests in protected areas and setting up new financial mechanisms that compensate communities, state and local governments, and countries for conserving forests. Meanwhile, forest-dependent people are gaining more management control over the forests they have long stewarded. Large international companies are finally establishing policies that exclude materials sourced via deforestation. People are abandoning rural areas, leading to forest recovery in some planes.

But the battle is far from over. Growing population and consumption means that rainforests will continue to face intense pressures. At the same time, climate change threatens to dramatically alter temperatures and precipitation patterns, potentially pushing some forests toward critical tipping points.

Thus the future of the world's rainforests in very much in our hands. The actions we take in the next 20 years will determine whether rainforests, as we currently know them, are around to sustain and nourish future generations of people and wildlife.

The Latest News on Rainforests

Growing appetite for açaí is damaging bird diversity in the Amazon (Jun 15 2026)
- A newly published study has found a 28% decline in bird species richness in Amazonian areas with high densities of açaí palms.
- Farmers are clearing away native trees and understory vegetation to plant more açaí palms as demand soars, in the process destroying vital habitats for both fruit- and insect-eating birds.
- While açaí is marketed as a sustainable “superfood,” exports from Brazil’s Pará state have surged by 885% in a decade, raising concerns about predatory monoculture.

Amazon deforestation alerts fall to lowest 12-month level since 2014, show Brazilian data (Jun 14 2026)
- INPE’s DETER alert system detected 370 square kilometers of deforestation in the Brazilian Amazon in May, down from 960 square kilometers in May 2025.
- Over the past 12 months, DETER registered 3,182 square kilometers of deforestation, the lowest total for any 12-month period in the system’s record dating back to July 2014.
- Independent monitoring by Imazon shows a similar downward trend, reinforcing evidence that forest clearing has continued to decline.
- Scientists warn that a likely strong El Niño could still increase drought, fire and forest degradation risks, even if clear-cutting remains low.

Amazon deforestation declines as Brazil reduces forest loss nationwide (Jun 12 2026)
Deforestation in Brazil’s Amazon biome fell by 23.5% in 2025 compared with 2024, according to a new report from MapBiomas, a Brazil-based land-use mapping project. Reductions in deforestation were recorded across the board in all of Brazil’s biomes, culminating in a 21% nationwide decrease in forest loss. In total, nearly 985,000 hectares (2.4 million acres) […]

In Ecuador, an Indigenous community goes thirsty despite its two rivers (Jun 12 2026)
- On the banks of the Puní River’s middle basin, in the Ecuadorian Amazon, illegal mining has increased by 2,700% over seven years, contaminating the main water source for the ancestral Kichwa community of Capirona.
- Residents of Capirona say that, by 2021, the color of the Puní River started to change, turning brownish. Meanwhile, problems such as skin rashes, fungal infections, and itching became frequent.
- In samples of mining ore collected by Ecuadorian authorities from an illegal mining camp on the banks of Puní, signs of mercury were found at levels far exceeding the permitted limit for this metal in agricultural soils.
- Industrial farming activity has also polluted the waters of the Shalkana River, another watercourse located within the community. Despite being surrounded by two rivers, residents of Capirona rely on two water tankers sent weekly by municipal authorities, which is enough for barely half of the families for just a few days.

Brazil carves an Amazon national park to make room for grain railway (Jun 11 2026)
- Brazil’s Supreme Court upheld a law removing 862 hectares (2,130 acres) from Jamanxim National Park, clearing a legal obstacle for the proposed Ferrogrão grain railway.
- The lower house in Congress also approved a measure reducing another Jamanxim conservation unit; although, the bill still must be voted on in the Senate.
- The project threatens Indigenous territories and key habitats for jaguars, giant otters and primates in an Amazonian region already facing extensive land grabbing and deforestation.
- Experts warn the ruling could make it easier to reduce protected areas elsewhere in Brazil for future infrastructure and development projects.

How an activist network built pressure without political power (Jun 11 2026)
- David Benac’s Rainforest Radicals traces how Rainforest Action Network grew from a small San Francisco-based activist group into an influential force in rainforest protection, Indigenous rights, and corporate accountability.
- The book follows RAN’s early campaigns against Burger King, True Geothermal, the World Bank, and Mitsubishi to show how the group linked distant forest destruction to everyday choices, public pressure, and corporate reputation.
- Benac shows how RAN combined decentralized organizing, nonviolent direct action, media spectacle, boycotts, and long-term support for local and Indigenous-led campaigns.
- The interview explores what RAN’s history can teach today’s environmental movements about leverage, persistence, outside solidarity, and the challenges that come when a radical network begins to win.

Environmental group intervenes in lawsuit to help orangutans, tigers in Indonesia (Jun 11 2026)
- Indonesia’s largest environmental group, Walhi, has officially intervened in an environmental lawsuit filed by the government against major pulpwood producer PT Toba Pulp Lestari.
- Walhi says the lawsuit overlooks key ecological impacts, such as critical orangutan and tiger habitats, that should also be addressed through court-ordered restoration.
- TPL is one of dozens of companies whose forest-use licenses were revoked after their forest-clearing activities were blamed for exacerbating floods and landslides during torrential rains in late November 2025.
- Walhi is asking that any funds recovered from the lawsuit be directed toward environmental restoration activities on the ground.

Evidence linking bats to Ebola inconclusive, scientist says. ‘Solution is not fear’ (Jun 10 2026)
- The current Ebola outbreak in the Democratic Republic of Congo has sparked efforts to develop a vaccine for this current strain, but has also brought renewed attention to the longstanding question of where the virus originates.
- As scientists race to better understand and contain the Bundibugyo strain, they continue to search for the origins and transmission pathways of this virus, which has a 50-60% mortality rate in humans and has also wiped-out substantial numbers of gorillas and chimpanzees.
- As with previous zoonotic disease outbreaks, bats are once again under scrutiny. During the COVID-19 pandemic, for example, bat colonies were destroyed in countries including India, Peru, and Cuba, while bats were culled in Indonesian markets and driven from urban areas in Rwanda amid fears about disease transmission.
- While there have been no reported cases of bat culls linked to the current Ebola outbreak, Dr. Paul Webala, a wildlife biologist at Maasai Mara University in Kenya who has studied bats for more than two decades, cautions against such actions. He argues that bats play a critical ecological role and notes that the scientific evidence linking bats directly to Ebola outbreaks remains inconclusive.

Colombia passes landmark cattle traceability law to combat illegal deforestation (Jun 9 2026)
Colombia passed a landmark law June 4 aimed at improving traceability of its cattle supply chain to ensure beef isn’t sourced from deforested land. The law hopes to enhance existing traceability systems and make it easier to identify when cattle have grazed in protected areas and forests that were illegally cleared for pasture. “This is […]

In Sumatra, social forestry links conservation with livelihoods (Jun 9 2026)
- Sri Atmiatun, a farmer in Indonesia’s Batutegi forest landscape, is among hundreds of community members participating in the country’s social forestry program, which grants legal access to state forest land while requiring sustainable management.
- The program has expanded farmers’ access to training, support and diversified agroforestry systems, contributing to reduced forest clearing and greater conservation awareness, although challenges related to markets, institutions and farming practices remain.
- Batutegi’s experience reflects both the opportunities and limitations of social forestry, as communities, government agencies and conservation groups work to improve livelihoods while preventing further forest loss.
- The changes are also creating new roles for rural women, whose growing involvement in farming enterprises and community organizations is reshaping local economies and decision-making.

Taiwan’s tallest tree found with help of citizen science (Jun 8 2026)
- Researchers have confirmed Taiwan’s tallest known tree: an 84.1-meter (276-foot) Taiwania fir they named “the Heaven Sword of the Da’an River.”
- A team called the “Taiwan tree seekers” found it after a decade-long search using airborne laser scans of the island’s forests.
- A group of 372 citizen scientists helped sort through the data, producing a map of 941 giant trees across Taiwan.
- The giant trees store huge amounts of carbon but face growing threats from drought, lifting clouds, stronger typhoons, and illegal logging.

How small actions can become planetary forces (Jun 4 2026)
- Nature’s Echo argues that feedback loops shape everything from the formation of stars and the spread of life to climate change, ecological recovery, and human behavior.
- Crowther is strongest when applying this framework to ecology, showing how forests, food webs, restoration, and resilience depend on the balance between reinforcing and stabilizing forces.
- The book moves from explanation to application, suggesting that restoration succeeds when nature recovery creates tangible benefits that people want to sustain.

It’s time to engage Mennonite communities in reducing deforestation across Latin America (analysis) (Jun 3 2026)
- Across 50 years and multiple countries, it’s clear that Mennonite colonies are systematic agents of deforestation in Latin America, yet they are seldom engaged by policymakers or NGOs seeking to reduce forest loss.
- In part this is due to the colonies’ closed nature but also because their habit of buying in frontier regions is effectively banned by law in Brazil — a nation which dominates the Amazon policy sphere —  but a new analysis posits that engagement with these groups is necessary and potentially fruitful.
- “Mennonite pioneers have transformed the South American forest frontier with remarkable, and unfortunate, efficiency. The question now is whether the legal, regulatory, and civil society frameworks of the countries where they now reside can engage them as partners in a different kind of transformation,” the author argues.
- This article is an analysis. The views expressed are those of the author, not necessarily of Mongabay.

Legal protections for Brazil’s isolated Indigenous peoples: Interview with prosecutor Daniel Luís Dalberto (Jun 3 2026)
- Across Brazil, orders known as land-use restrictions serve as temporary protective measures for the territories of recently contacted Indigenous peoples and those living in voluntary isolation.
- But while the measures are meant to allow time for the formal demarcation process to be carried out, they’ve now become an end to themselves, renewed repeatedly and failing to prevent the invasion and exploitation of these lands, says Brazilian federal public prosecutor Daniel Luís Dalberto.
- Dalberto told Mongabay in an interview that the measure is meant to be precautionary and accompanied by other protective measures by government agencies, such as monitoring work and operations to combat crime.
- He also raised concerns about the frequency with which issues affecting Indigenous territories are being raised to the country’s highest court, rather than being resolved at local courts and tribunals, which closes off an important front in the fight for fundamental rights.

Chimpanzees vs. a mega railway (Jun 3 2026)
A massive railway project, The Simandou corridor, in Guinea is cutting through one of West Africa’s most important ecosystems. The Simandou corridor is fragmenting forests that are home to the largest population of endangered western chimpanzees, putting their survival at risk. But why is this massive railway project being built? Deep within Guinea’s forests lie […]