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

Ecuador failing to end Yasuní oil drilling: Interview with Waorani leader Juan Bay (May 13 2026)
- Mongabay recently interviewed Juan Bay, the president of the Waorani Nation (NAWE) in Ecuador, on the stalled efforts to shut down oil drilling in Yasuní National Park that overlaps with Indigenous territories.
- A voter referendum in 2023 required the Ecuadorian government to shut down the 43-ITT oil block by August 2024, and the decision was backed up in a 2025 ruling by the Inter-American Court of Human Rights (IACHR).
- Since then, however, there’s been virtually no progress, Bay said, with the government having shuttered just 10 out of 247 oil wells in the block.
- Bay said communities continue to suffer from the environmental and cultural destruction caused by oil exploitation, as well as the internal divisions that formed between some Waorani communities.

Long dubbed a ‘climate refuge,’ warming Tasmanian forests need our help (May 12 2026)
- Tasmania has long been considered a global “climate refuge,” where cool, ocean-influenced conditions allow species like the giant freshwater crayfish to persist as mainland Australia warms.
- But new research shows that the world’s climate refuges are not immune to threats: shifting rainfall, warming waters, sediment runoff, land-use change and other impacts are eroding the ecological conditions that sustain numerous species.
- In Tasmania, emerging pressures are impacting the island’s biodiversity, ranging from warming and sedimentation in forest streams affecting sensitive crayfish habitat, to declining oxygen levels putting the endemic Maugean skate at risk.
- Scientists say protecting climate refuges now requires active coordinated management between federal, state and local partners, with multimillion-dollar investments in watershed restoration and ongoing conservation efforts.

New Jaguar Rivers Initiative aims to reconnect South America’s fragmented ecosystems (May 12 2026)
- Four major conservation groups have joined forces to establish the Jaguar Rivers Initiative across South America’s Paraná River Basin.
- Its goal is to protect the big cat and other threatened species, rewild native wildlife, and protect land throughout the basin, a biodiversity hotspot shared by Argentina, Bolivia, Brazil and Paraguay.
- Many rivers form the borders between the four countries, and by collaborating on protections, the initiative seeks to reconnect fragmented habitat, using rivers and riparian forests to rebuild wildlife corridors.
- By 2030, the initiative plans to protect at least 1,200 square kilometers (460 square miles) of land in these countries, preserving approximately 34 million metric tons of carbon at risk of being released through deforestation, fire and land-use change.

What tree rings reveal about climate change in the Amazon (May 11 2026)
- Scientists analyzed tree growth rings to investigate whether the Amazon Basin is indeed drying up, as shown by extreme droughts in 2023 and 2024.
- Their study revealed that over the past four decades, rainfall has become more intense during the wet season and scarcer during the dry season, indicating unprecedented extension of climate seasonality.
- Researchers point out that such intensification of extremes results from a combination of natural environmental variability, deforestation and climate change, with direct impacts on the forest and the carbon cycle.

A law to help Bolivian farmers may actually increase land grabbing, critics warn (May 11 2026)
- A new land reform law passed in April lets small farmers reclassify their land so that it can be used as collateral.
- But it also means they would lose protection from land seizure, which could allow big businesses to more easily buy up the land, some critics of the law say.
- The legislation could also help large landowners divide and sell their properties more easily, potentially leading to development and forest clearing in an area with one of the highest deforestation rates in the region.
- Last month, Indigenous groups started a march from the department of Pando to the capital, La Paz, to pressure the government to revoke the law.

Endangered golden-headed lion tamarin: Photo of the week (May 11 2026)
The golden-headed lion tamarin, captured in the photo above, is a small primate species found only in the northeastern Brazilian state of Bahia. The tamarins, Leontopithecus chrysomelas, have bright reddish-golden manes, and similarly colored paws and tails. They live among tree branches, eating fruit and the occasional bird egg or small vertebrate. They sleep huddled […]

Paraguay expanded a reserve in the Gran Chaco. Why is deforestation still rising there? (May 8 2026)
- Approximately 2.78 million hectares (6.87 million acres) were added to Paraguay’s Chaco Biosphere Reserve in 2011, yet the area continues to be one of the country’s worst hit by forest loss.
- Regulations are only selectively enforced by the government, if not entirely ignored, critics say.
- Property owners often exceed how much native vegetation they can legally clear on their land to make room for cattle pasture and agriculture.
- As the forest shrinks, Indigenous Ayoreo-Totobiegosode living in that part of the reserve have struggled to maintain voluntary isolation; they rely on the forest for food, shelter and medicine, and don’t have immunity to many outside diseases.

Forests, fires and fragile gains: Interview with WRI’s Elizabeth Goldman (May 8 2026)
- According to Global Forest Watch data released by the World Resources Institute (WRI) on April 29, tropical primary forest loss declined by 36% in 2025 compared to the previous year.
- While GFW’s data show that more than 4.3 million hectares (10.6 million acres) of tropical forest was cut down, this still represents the steepest single-year decline in two decades and offers a rare moment of optimism after consecutive years of forest destruction and record-breaking wildfires.
- Much of the improvement stems from Brazil, where renewed political will and enforcement under President Luis Inácio Lula da Silva played a decisive role.
- But while the decline suggests that protective policies and favorable weather can slow the destruction of the world’s forests, GFW’s Elizabeth Goldman warns that the progress is fragile.

Conservationists fear fires could erase years of orangutan habitat recovery (May 8 2026)
- Fires have burned part of a restoration site being prepared for orangutan habitat in Indonesia’s West Kalimantan province, raising fears that another severe fire season could undo years of recovery work.
- The restoration project, led by the government, Yayasan IAR Indonesia and local communities, has replanted about 300 hectares (740 acres) with 150,000 trees to help keep critically endangered orangutans out of nearby farms.
- Conservationists say the fires, likely sparked by nearby land clearing for oil palm, spread rapidly through dry peat and scrub vegetation, despite the area still being in the rainy season.
- With severe El Niño conditions forecast later this year, conservation groups warn they lack sufficient resources to fully prepare for another major fire season like the devastating 2015 crisis.

Deforestation and warming could push Amazon to tipping point by 2040s: Study (May 7 2026)
- Deforestation of 22-28% of the Amazon Rainforest, coupled with 1.5-1.9°C of global warming, could trigger a widespread shift of the Amazon Rainforest to degraded forest and savanna grassland ecosystems, a new study warns.
- This looming Amazon threshold modeled by researchers could be reached as early as the 2040s. Hitting this rainforest loss/global temperature threshold, or tipping point, could ultimately impact more than 70% of the Amazon Basin within decades, resulting in release of large amounts of carbon stored in forest and soils.
- Roughly 17-18% of the Amazon has already been deforested, and global temperatures are expected to rise to 1.5°C above preindustrial levels annually as early as 2030.
- Experts underline that the new findings reinforce the urgent need to halt Amazon deforestation, restore significant amounts of rainforest and drastically slash carbon emissions.

In one forest, native rats remain. In another, only invaders. (May 7 2026)
Founder’s Briefs: An occasional series where Mongabay founder Rhett Ayers Butler shares analysis, perspectives and story summaries. In a lowland forest in southeastern Madagascar, what was missing proved as telling as what was found. Researchers working in the Manombo Special Reserve trapped tufted-tailed rats in intact interior forest. But in the nearby degraded littoral areas, […]

Study finds microplastics in tadpoles in the Amazon for the first time (May 5 2026)
Researchers have recorded microplastics in frog tadpoles and their pond habitats in the wild in the Amazon for the first time, according to a new study. This confirms widespread microplastic contamination in the Amazon Rainforest, the researchers say.   Previous studies from the region have found microplastic contamination in fish, invertebrates, soil and water samples. […]

Australia’s declining tree health is a slow-burning crisis (commentary) (May 5 2026)
- Unlike destructive bushfires, tree health is often treated as a niche or technical issue, but its implications pose equally important questions about ecological resilience and public health, a new op-ed argues.
- Threats to Australian tree species are multiplying like an invisible bushfire via a proliferation of introduced insects and pathogens, the authors suggest, ahead of his country’s first national forum on the topic later this month, Safeguarding Australia’s Tree Health, in Brisbane.
- “We recognize bushfires as a national crisis because their impacts are visible and immediate, but some ecological crises arrive more quietly. If we fail to notice them early, the damage can become harder to reverse for forests, for biodiversity, and for the communities that depend on them,” they write.
- This article is a commentary. The views expressed are those of the authors, not necessarily of Mongabay.

Can listening to a forest reveal whether it is ecologically healthy? (May 4 2026)
Founder’s Briefs: An occasional series where Mongabay founder Rhett Ayers Butler shares analysis, perspectives and story summaries. Researchers have been using sound to study ecosystems for years. A study from ETH Zürich uses it to examine Costa Rica’s payment for ecosystem services program, reports Mongabay’s Abhishyant Kidangoor. Giacomo Delgado, a doctoral researcher, compares the method […]

Solar installation and deforestation in the Amazon: Photo of the week (May 4 2026)
In August 2025, photojournalist Victor Moriyama captured this scene on the outskirts of Rio Branco, the capital of Acre, a state in the far northwest of the Brazilian Amazon. As a row of trucks in the background carries piles of wood freshly logged from the rainforest, employees of Primaz Energia Solar, a local solar energy […]