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

A ‘devil-like’ flower from Thailand is new to science — and critically endangered (Sep 23 2026)
Botanists in Thailand have identified a new-to-science species of “fairy lantern” — plants that live almost entirely buried under leaf litter, emerging aboveground only occasionally to flower. Researchers were surveying evergreen forests in the mountains of Thong Pha Phum National Park when they chanced upon a plant none of them had ever seen before, at […]

Illegal mines threaten biodiversity and drinking water in Ghana’s Atewa Forest (Sep 21 2026)
- Forestry officials charged with protecting the Atewa Forest Reserve in eastern Ghana have been overrun by illegal miners whose operations are putting the water supply of millions of Ghanaians in jeopardy, according to conservation groups.
- Atewa is a biodiversity hotspot, with more than 80 threatened and endangered species found in its 26,300 hectares (65,000 acres).
- Environment group A Rocha Ghana and others have called on the government to provide greater resources to counter illegal mining in Atewa and elsewhere.

Venezuela’s historic oil deal with the US reignites environmental, human rights concerns (Sep 16 2026)
- The U.S. announced a historic oil deal in August that gives it access to more than 65 billion barrels of proven reserves in Venezuela, which is structured through a private company, North American Blue Energy Partners.
- It’s part of a U.S. attempt to increase investment in Venezuela’s natural resources, most notably oil and gas.
- The country has one of the largest proven crude oil reserves in the world, at an estimated 300 billion barrels. However, it’s heavier and harder to refine than the oil in other countries.
- Observers expressed concern about increased greenhouse gas emissions and oil spills, as well as the lack of transparency surrounding the deal, which could threaten protected areas and Indigenous territory.

Indigenous leader Raoni receives palliative care in Brazil after cancer diagnosis (Sep 15 2026)
SAO PAULO (AP) — Renowned Indigenous Chief Raoni Metuktire is receiving palliative care at home in the Brazilian heartland after being diagnosed with cancer at age 94, his institute said Monday. The Raoni Institute said the cancer diagnosis in the chief’s digestive system was confirmed after he was hospitalized in Sao Paulo in June due […]

Did you know cocoa pulp tastes like lychee?! (Sep 14 2026)
From a symbol of wealth and the food of the gods, to a sweet treat many of us can’t go too long without; the story of cacao (or cocoa, depending on how it was processed), has been intertwined with humanity’s for millennia! In this 4-part series on NTFPs (non-timber forest products) with The Rainforester and […]

The push for a sustainable artisanal mining in the Peruvian Amazon (Sep 12 2026)
MADRE DE DIOS, Peru — In Madre de Dios, in the Peruvian Amazon, thousands of people depend on gold mining, while the spread of mercury and deforestation are transforming the country’s most biodiverse tropical forest. In La Pampa, one of the region’s main gold mining hubs, a formalized artisanal mining operation is trying to prove […]

Indigenous peoples near Congo parks propose diverse solutions for the future of conservation (Sep 8 2026)
- Mongabay spoke with Indigenous people and members of local communities living near four national parks in the Congo Basin, in the Democratic Republic of the Congo, to gather their testimonies and learn about the solutions they envision for reconciling forest conservation with the rights of nearby communities.
- Many Indigenous peoples wish to return to their ancestral lands from which they were displaced when the national parks were established; though some still prefer that authorities continue to lead conservation efforts.
- Others, however, believe they should remain outside the parks, while calling for better living conditions and greater access to resources and economic opportunities to prevent environmental destruction.
- Initiatives such as community forest concessions, local employment and ecotourism programs seek to reconcile conservation, land rights and the needs of communities, but their implementation continues to face tensions and significant challenges.

Indigenous territories maintain Amazon forest just as well as protected areas, study finds (Sep 8 2026)
A new study has found that in Ecuador’s Amazon, Indigenous territories without formal conservation contracts maintained forest conditions just as well as formal protected areas. Ecuador has three different approaches to forest governance: Forests protected by government institutions, forests managed by local communities under formal conservation agreements and Indigenous territories without formal conservation agreements. To […]

Tanzania’s first official wildlife corridor links savanna elephants to rainforest (Sep 4 2026)
- African savanna elephants are using a narrow strip of land across the densely populated Kilombero Valley in southern Tanzania to migrate.
- It’s Tanzania’s first officially designated wildlife corridor, linking Nyerere National Park’s open savanna woodlands with the high-altitude rainforests of the Udzungwa Mountains National Park.
- Local landowners have designated parts of their farms for the corridor and co-manage it with the government.
- Experts note that vigilance is needed to prevent some planned development, which could negatively impact the corridor.

A ‘lost’ Philippine pigeon reappears after 20 years — but its forest is disappearing (Sep 3 2026)
- Philippine conservation nonprofit CCIPH and Indigenous Iraya Mangyan forest patrollers documented a Mindoro bleeding-heart pigeon, providing the first confirmed image of the critically endangered species in two decades.
- Two independent ornithologists confirmed the identification based on the bird’s orange-red breast marking, iridescent green plumage, and other distinctive features.
- The image was recorded at an elevation above 900 meters (about 3,000 feet), higher than the species’ typical lowland range of 400-88 m (1,300-2,600 ft).
- Experts called for expanded camera-trap surveys, a comprehensive population. assessment, stronger habitat protection, and measures to address logging, poaching and accidental trapping.

Invaders storm Indigenous Amazon land, threatening isolated people (Sep 2 2026)
- About 200 people have invaded the Ituna/Itatá Indigenous Land in Brazil’s Pará state since August 13, breaking through Brazil’s Indigenous Affairs Agency (Funai) gates, removing signs and establishing camps.
- The invasion followed the creation of the Bacajaí Environmental Protection Area that completely overlaps with the federally protected Indigenous Land — creating legal confusion which authorities say has been exploited by individuals who wish to occupy the area.
- Federal authorities have warned of an imminent risk of confrontation and potentially genocide against Indigenous people living in voluntary isolation and have called for the urgent deployment of the National Force and Federal Police.
- On August 26, a federal court ordered the Union and Funai to send teams from the Public Security Force within 48 hours to contain the invasion but the deadline has passed and the teams have not yet arrived.

Logging operations uncovered at Cambodian senator’s dam in the Cardamoms (Sep 2 2026)
- Construction of the Stung Russei Chrum Kandal hydropower dam inside Phnom Kravanh National Park, one of Cambodia’s largest protected rainforests, began in 2023.
- Satellite imagery suggests forest clearance and large-scale logging are happening beyond the authorized construction sites.
- Experts say the images reflect a wider pattern in Cambodia of exploitation of licenses for dam development to further illegal logging operations.

Scientists use mining data to build malaria alert system in the Amazon (Sep 1 2026)
- Researchers have found a direct link between illegal mining, miners’ routes, and malaria cases in the Yanomami Indigenous Territory in Brazil.
- Now, they’re working on an alert system that will rely on mining data to warn local health agents about the risk of a malaria outbreak.
- The number of malaria cases dropped sharply after authorities expelled illegal miners from the Yanomami land, but Indigenous people worry the potential return of a right-wing government after October’s election could revive the humanitarian crisis.

For 50 years, Philip Fearnside has calculated the costs of losing the Amazon (Aug 31 2026)
- Philip Fearnside has spent 50 years studying the practical limits of Amazon development, beginning with the agricultural settlements built along Brazil’s Trans-Amazonian Highway. His work repeatedly asked who benefits from projects and who bears their longer-term costs.
- He produced influential research on deforestation, forest carbon, tropical dams, and the wider effects of roads, often challenging official assumptions about emissions and economic viability. He later contributed to the IPCC’s work on climate change.
- Fearnside has paired research with public engagement, publishing in Portuguese, writing for Amazônia Real and Mongabay, speaking to journalists, and testifying on projects including the BR-319 highway. That role has also made him a target of hostility, including at a 2021 public hearing where his microphone was cut.
- Former students and colleagues credit him with generous, exacting mentorship and an unusual command of the scientific literature. At a recent tribute at Brazil’s National Institute for Amazonian Research, he rejected any suggestion of a farewell: he intends to keep working.

‘They will do it legally or illegally’: Interview with James Giahyue on Liberia’s cocoa boom (Aug 26 2026)
- In July, Mongabay published a feature investigation and video report about deforestation in southeastern Liberia dude to cacao cultivation.
- The remote region contains some of West Africa’s last intact rainforests, many of which are under threat due to the emergence of the cacao industry there.
- Liberian journalist James Giahyue told Mongabay that poverty and the involvement of local politicians are helping to drive deforestation there.