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

‘I’m proud to be the first published Asháninka researcher’: Richar Antonio Demetrio on bees (Jan 2 2026)
- Richar Antonio Demetrio is the first Indigenous Asháninka scientist to publish in a high-impact journal, combining traditional ecological knowledge with scientific methodology to study meliponiculture, the farming of stingless bees.
- His first paper, published in March 2025, reveals that Asháninka communities can identify more than 14 plant species used by stingless bees to build their nests, and apply sustainable practices in honey production.
- His second warns that more than 50% of the habitat of stingless bees in the Avireri-Vraem Biosphere Reserve overlaps with areas at high risk of deforestation.
- In an interview with Mongabay, Demetrio talks about the challenges he faced from both the scientific and Indigenous communities during his studies, and about the importance of balancing Western scientific methods with age-old traditional knowledge.

Deforestation climbs in Central America’s largest biosphere reserve (Dec 31 2025)
- Nicaragua’s Bosawás Biosphere Reserve has lost more than a third of its primary forest cover since the turn of the century.
- 2024 marked the biggest year of deforestation, with 10% of Bosawás cleared in just one year.
- Cattle ranching is among the top causes of forest loss, with outsiders encroaching into Bosawás to clear forest for pasture.
- Indigenous advocates and residents say the loss of forest is threatening their way of life, and that they have faced violence due to encroachment.

Mercury, dredges and crime: Illegal mining ravages Peru’s Nanay River (Dec 31 2025)
- Mongabay Latam flew over the basins of the Nanay and Napo rivers, in Peru’s Loreto region, and confirmed mining activity in this part of the Peruvian Amazon.
- Environmental prosecutors say that there may be even more boats and mining machinery hidden in the ravines of both rivers.
- During the flyover, authorities confirmed the use of not only dredges, but also of mining explosives, which they say destroy the riverbanks.
- Almost 15,140 liters (4,000 gallons) of fuel have been confiscated from illegal mining networks around the Nanay River in the last two years, but authorities’ efforts seem insufficient.

A new frog species emerges from Peru’s cloud forests — and it’s already at risk (Dec 30 2025)
- Local communities and scientists have discovered a new-to-science frog species, Oreobates shunkusacha, in the cloud forests of the Bosques de Vaquero Biocorridor, in the San Martín region of Peru.
- Its name, Shunku Sacha, which in Kichwa-Lamista means “heart of the forest,” honors the local communities leading conservation work in the area.
- In a study describing O. shunkusacha, researchers write that the species is likely endangered.
- Over the past 40 years, the Lake Sauce sub-basin, where the frog lives, has lost nearly 60% of its forest cover, placing both the survival of the newly discovered species and the stability of this ecosystem at risk.

Satellite data show forest loss persists in Brazilian Amazon’s most deforested reserve (Dec 30 2025)
- Brazil’s Triunfo do Xingu Environmental Protection Area was established to protect a swath of the Amazon Rainforest from the cattle industry.
- However, satellite data show the reserve has lost around 50% of its primary forest cover since it was created in 2006.
- The data show forest loss peaked in 2024, and continued into 2025.
- Research indicates rates of deforestation are higher in Triunfo do Xingu than in the unprotected areas around it.

Rare bats at risk as iron ore mine advances in Guinea’s Nimba Mountains (Dec 30 2025)
- Guinea’s government is assessing the potential impacts of a mining project in the Nimba Mountains, in a biodiversity hotspot that has been recognized as a UNESCO World Heritage Site while being threatened by mining.
- U.S. mining company Ivanhoe Atlantic recently submitted an environmental impact assessment for an iron ore mine at a site that is the only known home of two unique bat species, as well as critically endangered chimpanzees and threatened toads and frogs.
- Conservationists say open-pit mining in this ecologically sensitive region could spell extinction for Lamotte’s roundleaf bat and the orange-furred Nimba Mountain bat if their forest habitat is disturbed for mine infrastructure.

Southeast Asia’s 2025 marked by fatal floods, fossil fuel expansion and renewed mining boom (Dec 29 2025)
- 2025 has been a year of global upheaval, and Southeast Asia was no exception, with massive disruption caused by changes in U.S. policy and the intensifying effects of climate change.
- The region is poised at a crossroads, with plans to transition away from fossil fuels progressing unevenly, while at the same time a mining boom feeding the global energy transition threatens ecosystems and human health.
- On the positive side, deforestation appears to be slowing in much of the region, new species continue to be described by science, and grassroots efforts yield conservation wins.

The year in rainforests 2025: Deforestation fell; the risks did not (Dec 26 2025)
- This analysis explores key storylines, examining the political, environmental, and economic dynamics shaping tropical rainforests in 2025, with attention to how policy, markets, and climate stress increasingly interact rather than operate in isolation.
- Across major forest regions, deforestation slowed in some places but degradation, fire, conflict, and legacy damage continued to erode forest health, often in ways that standard metrics fail to capture.
- Global responses remained uneven: conservation finance shifted toward fiscal and market-based tools, climate diplomacy deferred hard decisions, and enforcement outcomes depended heavily on institutional capacity and credibility rather than formal commitments alone.
- Taken together, the year showed that forest outcomes now hinge less on single interventions than on whether governments and institutions can sustain continuity—of funding, governance, science, and oversight—under mounting environmental and political strain.

Conservation wins in 2025 that pushed us closer to the 30×30 goal (Dec 26 2025)
The “30 by 30” biodiversity target to protect 30% of the Earth’s land and ocean by 2030 is fast approaching — and the world is far off the pace needed for success: Less than 10% of oceans and just 17.6% of land and inland waters enjoy some sort of protection.   Still, 2025 saw some […]

Tropical forests in Australia are emitting more carbon than they capture: Study (Dec 23 2025)
- A newly published study reveals that moist tropical forests in Australia are now a net carbon emitter, making this the first documented case of tropical forest woody biomass making the flip from sink to source.
- Researchers analyzed nearly five decades of data and found that around the year 2000, these forests stopped absorbing more carbon than they emitted and went into a reversal.
- They identified tree deaths as the core problem, showing that these doubled compared to earlier decades, with new growth unable to keep pace.
- Climate change and cyclones are to blame, as rainforest species evolved for warm, wet conditions, but are now facing temperature extremes and extended droughts that damage their tissues and stunt growth.

A flood of logs post-Cyclone Senyar leaves Padang fishers out of work (Dec 20 2025)
- Flash floods in late November swept timber and mud from upstream forests into coastal waters around Padang, blocking access to the sea and cutting off the livelihoods of hundreds of fishers.
- Fishers say massive floating logs have damaged boats and halted daily incomes, forcing many families to rely on credit to meet basic needs.
- Marine scientists warn that suspended sediment and decaying timber threaten coastal ecosystems by blocking sunlight, disrupting food chains and degrading water quality.
- Environmental groups link the disaster to illegal logging and weak forest governance upstream, calling for stronger law enforcement, national disaster status and urgent government action.

Researchers find concerning gaps in global maps used for EUDR compliance (Dec 19 2025)
- Most companies importing certain products into the EU must comply with the European Union’s Regulation on Deforestation-free products (EUDR), which will go into application on Dec. 30, 2026.
- Satellite and other remote-sensing maps can guide both companies trying to comply with the regulation and government agencies verifying levels of deforestation risk attached to imports.
- But a recent review paper suggests that most of the available maps struggle to meet all of the requirements of the EUDR and could over- or underestimate the risk of deforestation for certain products.
- A key issue is the maps’ ability to differentiate forest from systems that look similar, such as agroforestry, commonly practiced by smallholder farmers producing cocoa, coffee and rubber.

Congo’s communities are creating a 1-million-hectare biodiversity corridor (Dec 18 2025)
- The NGO Strong Roots Congo is securing lands for communities and wildlife to create a 1-million-hectare (2.5-million-acre) corridor that spans the space between Kahuzi-Biega National Park and Itombwe Nature Reserve in the Democratic Republic of Congo.
- The effort requires multiple communities to register their customary lands as community forestry concessions under an environmental management plan, which, piece by piece, form the sweeping corridor.
- To date, Strong Roots has secured 23 community forest concessions in the area, covering nearly 600,000 hectares (1.5 million acres) of land.
- The corridor aims to rectify a historical wrong in the creation of Kahuzi-Biega National Park, which displaced many families, by engaging communities in conservation. Advocates say the project has had a positive impact so far despite challenges, but persistent armed conflict in the eastern DRC is slowing progress.

Tapanuli orangutan, devastated by cyclone, now faces habitat loss under zoning plans (Dec 18 2025)
- A proposed zoning overhaul in Indonesia’s North Sumatra province could strip legal protections from nearly a third of the Batang Toru ecosystem, threatening the last remaining habitat of the critically endangered Tapanuli orangutan.
- The proposal came just before a powerful cyclone triggered floods and landslides that may have killed or displaced dozens of Tapanuli orangutans and severely damaged thousands of hectares of forest.
- The changes would weaken scrutiny of mining and plantation projects, including a planned expansion of a nearby gold mine, by removing the area’s “provincial strategic” designation.
- Conservationists say rolling back protections now would be a “nail in the coffin” for the species, calling for emergency protections and expanded conservation measures to prevent population collapse.

New study points to private land as key to Atlantic Forest recovery (Dec 16 2025)
- A new study shows that restored private lands in Brazil’s Atlantic Forest achieved up to 20% more forest cover than unrestored neighboring private lands.
- With 75% of the Atlantic Forest in private hands and a 6.2-million-hectare (15.3-million-acre) deficit of native vegetation, according to the law, private landowners are key to recovery.
- Over the past decade, forest gains and losses in the Atlantic Forest have essentially stagnated; but last year, half of all deforestation hit mature forests over 40 years old, threatening biodiversity and carbon stocks.