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

Khuiusi Khisêtjê helped his people recover their land and future in the Xingu (Jul 24 2026)
- Khuiusi Khisêtjê assumed leadership after disease and violence reduced his people to around 50 and killed many of their elders.
- He helped recover the Wawi Indigenous Territory, which contained ancestral villages, sacred places, and the graves of Khisêtjê relatives.
- He worked to preserve Khisêtjê songs, language, oral history, and cultural knowledge while preparing younger leaders to navigate Brazilian institutions.
- As soy farms and pesticide use expanded around the territory, he continued defending the land and, in 2018, led his community deeper into the forest.

Vietnam’s coffee boom fueled by decades of deforestation, report finds (Jul 22 2026)
Decades of unchecked deforestation for coffee production has devastated Vietnam’s Central Highland forests, according to a new investigation by the Berlin-headquartered watchdog group Coffee Watch. Vietnam is currently the world’s second largest coffee producer, supplying nearly 40% of the world’s exports of Robusta coffee (Coffea canephora). The investigation, which analyzed satellite data and government records, […]

Amazon tree rings reveal more intense drought and rainfall in the rainforest (Jul 21 2026)
Tree rings from the Amazon show that the world’s largest rainforest has developed wetter wet seasons and drier dry seasons over the past four decades. The findings point to intense seasonal swings that can cause significant harm to biodiversity and suggest that widespread drying out across the entire Amazon basin is unlikely.  Researchers collected tree […]

From rivers to mangroves, microplastics are contaminating the Amazon (Jul 20 2026)
- Recent studies show that microplastics are already present in a variety of Amazonian environments: Major rivers such as the Amazon, urban streams, floodplain areas and mangroves in the Amazon’s Mouth.
- In a single lake in eastern Manaus, researchers found microplastics in the intestines of half the jaraquis — the most consumed fish in Amazonas state
- The contamination is related to irregular waste disposal and lack of sewage collection and treatment, which allow household residues to flow directly into water bodies.
- This is the first story in a three-part special series on microplastics in the Amazon region; upcoming pieces will look into the effects of these particles on aquatic and terrestrial organisms.

Can harpy eagles attack humans? Amazon case rekindles scientific debate (Jul 17 2026)
- An attack by a harpy against a tourist in French Guiana has sparked a debate about interactions between humans and the world’s largest eagle.
- Field reports indicate that these episodes are uncommon and usually associated with defending prey, but they can result in serious injuries.
- Although rare, these cases expose a conservation dilemma: They may reinforce stigma against the species but also reveal real conflicts about which there is little public debate.

The vanishing forests on Liberia’s cocoa frontier (Jul 16 2026)
- Liberia’s remote southeast, home to some of West Africa’s last remaining rainforests, is facing a deforestation crisis driven by cacao farming.
- Tens of thousands of workers from neighboring Côte d’Ivoire have migrated across the border in recent years, driven by land shortages and a price boom.
- This “cocoa rush” destroyed more forest in Liberia’s Grand Gedeh county last year than in any county on record since 2002.

Amazon deforestation falls to 10-year low in first half of 2026 (Jul 16 2026)
Deforestation in the Brazilian Amazon has fallen to its lowest level in the past 10 years, according to satellite data published by Brazil’s National Space Agency (INPE). Between January and June 2025, a total of 2,090 square kilometers (807 square miles) of deforestation was recorded in the Brazilian Amazon. In the same months of 2026, […]

South Africa’s free-roaming cheetahs in steep decline, first national census finds (Jul 15 2026)
- The first thorough census of free-roaming cheetahs in South Africa finds less than 100 mature adult individuals, much less than previous estimates.
- The researchers confirmed cheetahs in less than half of what is currently defined as suitable habitat by the IUCN and called for the adjustment of habitat maps based on current field data.
- The biggest threats are habitat fragmentation due to development and infrastructure, and persecution by landowners who perceive cheetahs as threats to their livestock.

Warming world could push Southeast Asia forests toward thermal limits, new study (Jul 15 2026)
- Countless forest-dwelling species depend on the cooler, moister and more stable conditions found in the understory, beneath leafy tree canopies.
- A new study from Southeast Asia finds the combined pressures of global warming and habitat degradation could send forest understory heat levels soaring within the next three decades, potentially exposing species to unprecedented levels of thermal stress.
- The findings can help prioritize conservation action on vulnerable landscapes, intact forests and heat-resilient areas that could become important refuges for forest species, the research team says.
- Experts say gaining a fuller picture of how forest-dwelling species will be affected by climate change will ultimately require further studies that consider additional factors, such as humidity, wind and ecosystem feedbacks.

How Brazil’s federal fiscal policy hinders Amazon Rainforest conservation (commentary) (Jul 15 2026)
- The three Brazilian states whose territory is mostly Amazon Rainforest — and carry the heaviest share of its conservation burden — are among the poorest and most fiscally dependent in the country.
- Amapá, Acre, and Amazonas operate on budgets so dependent on federal funding that they have almost no ability to act on their own, yet they are also precluded from developing their economies within their vast and federally protected swaths of forest.
- “It is a design flaw in Brazil’s fiscal constitution, and it is getting worse,” a new op-ed argues. “Brazil cannot credibly lead global climate diplomacy while its Amazonian states remain fiscally trapped.”
- This article is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

Cutting back vines lets recovering forests grow faster, Borneo study shows (Jul 13 2026)
- A new study in Borneo finds that cutting lianas increases canopy height in regenerating logged forests three times faster than tree planting alone.
- Lianas are fast growing woody vines that are a key part of tropical forests, but can proliferate in logged or disturbed forest.
- Researchers around the world are exploring how removing or thinning lianas by cutting their stems influences forest regeneration.
- Using Light Imaging Detection and Ranging (LiDAR) data, the new study found that accelerated tree growth and lower tree mortality contributed to increased canopy height following liana cutting.

Dark earth: Ancient Amazonian soil can boost forest restoration, study finds (Jul 8 2026)
- Researchers from the University of São Paulo and the Brazilian Agricultural Research Corporation showed in a study that the ancient organic-rich soil known as Amazonian dark earth (ADE) boosted seedling growth under real field conditions.
- The investigation suggests ADE could work as a “biological engineer” by reshaping the soil’s microbiome, increasing beneficial fungal diversity and reducing pathogenic microbes that hinder tree growth.
- With conservation in mind, scientists are now working to isolate these micro-organisms to develop bioinputs for forest restoration without disturbing the original Amazonian dark-earth deposits.

A fraction of promised climate money reaches Amazon communities: Interview with Latimpacto’s leaders (Jul 8 2026)
- Despite major funding pledges for the Amazon, much of the promised capital never reaches Indigenous peoples and local communities, often because funding structures are poorly aligned with on-the-ground realities.
- Latimpacto, a Colombia-based philanthropic network, is working to close this gap through initiatives that train funders, support locally led innovation and integrate Indigenous knowledge into conservation and development projects.
- Mongabay spoke with Latimpacto’s leaders, Carolina Suárez Visbal and Juan David Ferreira, who say the organization is also advocating for stronger domestic philanthropy across Latin America, arguing that better tax incentives, trust-based grantmaking, and patient, flexible capital are needed to complement international funding.
- Suárez Visbal and Ferreira say they see greater collaboration between Latin America and Southeast Asia as a key opportunity, calling for shared funding mechanisms and knowledge exchange to strengthen conservation of tropical forests and broader socioecological resilience.

Dusky langurs start using new canopy bridge in Malaysia’s Penang Island (Jul 6 2026)
Endangered dusky langurs have successfully begun using a new artificial canopy bridge in a major tourism hub on Malaysia’s Penang Island. Camera traps set up by the Langur Project Penang (LPP) confirmed that the first dusky langur (Trachypithecus obscurus) crossed the bridge made out of old fire hoses on June 1, about two months after […]

Can selective logging help the Congo Basin store more carbon? (Jul 2 2026)
- A recent study created a machine-learning program that estimated the amount of carbon dioxide already stored, and sequestered annually, by rainforests in Central Africa’s Congo Basin, the planet’s largest forested carbon sink.
- They found that managed logging concessions, which remove a small number of large trees annually and strictly control other human activities, made up more than half of the net carbon removed by Congo Basin rainforests.
- The authors say these results suggest that expanding logging concessions could help the Congo Basin sequester more carbon while also providing locals with a source of income.
- Other experts, however, argue that addressing local conflicts that lead to illegal forest clearing would be a better way to benefit these forests.