RAINFOREST INFORMATION

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

Sections:

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

Climate or biodiversity? Global study maps out forestation’s dilemma (Mar 6 2026)
- A new study maps areas designated for potential carbon dioxide removal projects, such as planting forests or bioenergy crops, that might conflict with biodiversity hotspots.
- Such climate strategies could harm species if they change existing ecosystems or use too much land.
- The study points to the importance of more careful site selection for these projects.
- The authors of the study also note the importance of reducing humanity’s CO2 emissions, rather than relying solely on removing CO2 from the atmosphere later on.

Cameroon’s decade of conflict leaves apes and conservationists in peril (Mar 3 2026)
- Dozens of protected areas in Cameroon’s anglophone regions, including parks that are home to great apes and other threatened species, have been swept up in a decade-long armed conflict between government forces and separatist militias.
- The ongoing conflict has blocked conservationists’ access to forests, and exposed conservationists, local civilians and the region’s wildlife to violence.
- Displaced people have turned to farming and hunting in forests in order to survive, while militias also hunt and camp in the forest.
- Conservationists have explored new strategies to keep their work alive, including working with local citizen scientists, but say the task of rebuilding organizations in the midst of a humanitarian crisis is huge.

Birds are changing — and Indigenous memory is the longest record we have (Mar 3 2026)
- A global study drawing on Indigenous and local knowledge across three continents finds that bird communities have shifted toward smaller-bodied species over the past 80 years, suggesting a substantial loss of larger birds even in places with little formal monitoring.
- Traditional ecological knowledge, built through daily interaction with landscapes over generations, can reveal long-term environmental changes that scientific datasets — often only decades deep — fail to capture.
- Because larger species tend to be more vulnerable to habitat fragmentation and environmental stress, a shift toward smaller birds may signal deeper ecological restructuring rather than a simple decline in numbers.
- Integrating lived experience with scientific methods offers a fuller picture of environmental change, highlighting that some of the earliest warnings come from people who depend most directly on the natural world.

Agroforestry offers market-based way to boost Amazon rains & farmer incomes (analysis) (Feb 25 2026)
- Since the 1970s, Brazil has cleared a large amount of Amazon Rainforest, and the consequences extend beyond biodiversity loss, carbon emissions and social disruption, because the forest generates its own weather.
- Continued deforestation could push the system past a tipping point where the Amazon can no longer sustain its rainfall regime, threatening the continent’s productive capacity and the economic livelihoods of hundreds of millions of people.
- The economic opportunity that can change this is agroforestry systems that reforest areas to produce global commodities that can also comply with Brazil’s Forest Code, which requires private properties in the Amazonian region to maintain native vegetation on 80% of their landholdings.
- This article is an analysis. The views expressed are those of the author, not necessarily of Mongabay.

Indigenous communities oppose Papua forest rezoning for palm oil (Feb 25 2026)
- Indigenous communities in Indonesian Papua have filed an administrative objection against forestry ministry decrees that reclassify more than a million acres as nonforest land, clearing the way for oil palm development under the government’s food estate program.
- The rezoning last September was carried out without the communities’ knowledge or consent, and the affected areas include swaths of forest that they have proposed as customary forests.
- The communities only learned of the decision months later, after NGOs obtained the decree. If the ministry fails to respond to their objection, they plan to sue in the State Administrative Court.
- The expansion aligns with the government’s drive to boost food and biofuel production, but Indigenous rights advocates warn the plan could cost communities their forests, livelihoods and cultural ties to the land.

A journey from student to Amazon “Junglekeeper”: Interview with Paul Rosolie (Feb 23 2026)
- Conservationist Paul Rosolie published a new book describing his journey from student to Amazon “Junglekeeper.”
- In a wide-ranging interview, Rosolie talks about uncontacted tribes, drug traffickers and the distance he still needs to go to achieve his goal of protecting the Las Piedras River.
- Rosolie also discusses the personal challenges and sacrifices of devoting his life to this slice of the Peruvian Amazon.

The cost of compliance with the EUDR will limit its impact on reducing deforestation (commentary) (Feb 23 2026)
- Many links in agri-commodity supply chains have very narrow profit margins, making them particularly sensitive to additional costs.
- The costs of implementing “zero deforestation” agri-commodity supply chain commitments requiring physical segregation are likely to cause positively engaged companies to avoid commodities grown in regions with active deforestation, leaving companies with no deforestation commitments in their place.
- Contrary to dominant beliefs in adding controls and costs, systemically linking markets and public policy in producer regions enables cheaper, more price-competitive and thus more effective forest-climate strategies; jurisdictional REDD+ is poised to provide such a bridge, argue Bjørn Rask Thomsen, Europe Director at Earth Innovation Institute and former food industry CEO and Daniel Nepstad, Executive Director and President at Earth Innovation Institute in this op-ed.
- This article is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

Indonesia faces scrutiny over permit revocations following deadly floods and landslides (Feb 20 2026)
- The Indonesian government is facing new scrutiny of its revocation of 28 forestry, plantation and mining permits following Cyclone Senyar, which triggered landslides and flash floods that killed around 1,200 people.
- An analysis by the NGO Auriga Nusantara found that some of the permits cited in the announcement had already been revoked years earlier, while others had expired before the floods occurred.
- The discrepancies add to growing confusion over which companies are actually linked to the November 2025 floods and landslides and what will happen to former concession areas now slated for transfer to state-owned enterprises under the sovereign wealth fund Danantara.

The Amazon’s most valuable export isn’t timber — it’s rain (Feb 19 2026)
- Tropical forests actively generate rainfall by releasing moisture into the atmosphere, with each square meter producing hundreds of liters of rain annually across surrounding regions. Clearing even small portions can measurably reduce precipitation, especially during dry seasons.
- Much of the rain that falls far inland originates from forests through long-distance moisture transport known as “flying rivers,” meaning farms, cities, and reservoirs may depend on ecosystems located hundreds or thousands of kilometers away.
- Reduced rainfall from deforestation can undermine agriculture, river flows, and hydropower, revealing forests as a form of natural water infrastructure that supports food production, energy systems, and economic stability.
- By assigning a monetary value to forest-generated rainfall, researchers estimate the service in the Amazon alone is worth on the order of tens of billions of dollars annually, underscoring that forest loss threatens not only biodiversity and carbon storage but regional climate systems themselves.

Banks must step in before the Amazon Soy Moratorium collapses (commentary) (Feb 18 2026)
- Finance is often portrayed as distant from environmental destruction, but in reality, it sits at the center: banks and investors decide which business models survive and which harms they will tolerate.
- Right now, a successful agreement called the Amazon Soy Moratorium, which has helped protect millions of hectares of forest by stopping major traders from buying soy grown on Amazon land deforested after 2008, is on the brink of collapse due to industry pressure — but banks can play a role in ensuring these traders stay in the pact and don’t let it unravel.
- “Financial institutions should make continued access to capital conditional on compliance with the moratorium’s core principles: no deforestation after 2008, full traceability, and zero tolerance for forest destruction in the Amazon biome,” a new op-ed argues.
- This article is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

Amazon deforestation on pace to be the lowest on record, says Brazil (Feb 17 2026)
- Near-real-time satellite alerts show Amazon deforestation in Brazil continuing to decline into early 2026, with clearing from August through January falling to its lowest level for that period since 2014.
- Over the previous 12 months, detected forest loss also dropped to a 2014 low, reinforcing a broader downward trend that is corroborated by official annual data and independent monitoring. Clearing in the neighboring Cerrado savanna has also fallen
- Environment Minister Marina Silva attributed the decline to strengthened enforcement and municipal cooperation, saying Brazil could record the lowest Amazon deforestation rate since record-keeping began in 1988 if current efforts continue.
- While the data is positive for conservation advocates, short-term satellite data can fluctuate seasonally, and long-term outcomes will depend on economic pressures, infrastructure expansion, and climate-driven risks such as drought and fire.

Malaria outbreak among Indigenous Pirahã linked to forest loss, satellite data find (Feb 17 2026)
- According to data from Global Forest Watch, the Pirahã Indigenous Territory in Brazil lost 7,000 hectares of tree cover from 2002-24.
- A large spike occurred in 2024, when the territory lost 3,200 hectares of tree cover.
- Government officials told Mongabay that the recently contacted Pirahã people are facing a malaria outbreak, and the deforestation is the result of an effort by Brazil’s Indigenous affairs agency to improve food security.
- The situation is complex, conservationists say, and although the clearings to plant crops may exacerbate the risk of malaria, the Pirahã people need food to improve their ability to fight the disease.

Scientists can’t agree on where the world’s forests are (Feb 17 2026)
- A global comparison of ten satellite-based forest datasets found striking disagreement about where forests are located, with only about a quarter of mapped forest area recognized by all sources. Differences in definitions, resolution, and methodology mean that estimates of forest extent vary widely depending on the map used.
- The inconsistencies are greatest in dry forests and fragmented landscapes, where sparse tree cover makes classification difficult. Even small technical choices—such as canopy thresholds or sensor type—can determine whether an area counts as forest at all.
- These discrepancies translate into large differences in real-world indicators. Estimates of forest carbon in Kenya, forest-proximate poverty in India, and habitat loss in Brazil varied dramatically across datasets, with potential implications for funding, policy, and conservation priorities.
- Because forest maps underpin climate targets, biodiversity planning, and development decisions, the authors urge treating estimates as ranges rather than precise figures and testing results across multiple datasets. Greater standardization and transparency, they argue, will be essential for credible monitoring of global environmental goals.

That “butterfly” you saw? It was probably a moth (Feb 17 2026)
Most people think moths are dull, nocturnal, and nothing like butterflies. That couldn’t be more wrong. In the Amazon rainforest, moths come in every color, shape, and size — and many are active during the day. In fact, while there are only about 18,000 species of butterflies worldwide, there are over 160,000 species of moths. […]

Forests don’t just store carbon. They keep people alive, scientists say (Feb 13 2026)
- Forests influence climate not only by storing carbon but by cooling the air, moderating extreme temperatures, and regulating water flows in ways that directly affect human well-being, concludes an academic review published this week in the journal Science.
- These effects are strongest at the local level: intact forests can make surrounding areas markedly cooler, stabilize rainfall, and create microclimates that support agriculture, health, and daily life.
- When forests are cleared, those protections can disappear quickly, often producing hotter, drier conditions and exposing large populations to increased heat stress and associated health risks.
- The greatest climate benefits occur where forests are native, underscoring that protecting and restoring natural ecosystems can be as important for adaptation to climate change as for reducing emissions, argues the paper.