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

On World Rainforest Day, stories of Amazon danger and resistance (Jun 20 2025)
Rainforests are among the most critical ecosystems on Earth. Home to roughly half of all terrestrial species, they provide oxygen and habitat, and help regulate regional rain and weather patterns. In honor of World Rainforest Day on June 22, we look at two recent Mongabay investigations that shed light on the challenges and triumphs in […]

In Peru, Yine women show how defending the Amazon supports local livelihoods (Jun 18 2025)
- Women from the Yine Indigenous community in Peru are working to harvest and process the seeds of the murumuru, a native Amazonian palm tree.
- The community of Monte Salvado, where many Yine people live, borders the Madre de Dios Territorial Reserve and Alto Purús National Park, two areas that are often traversed by Indigenous peoples living in voluntary isolation.
- Community leaders warn that illegal loggers have been destroying the forests of these isolated communities, forcing them to travel to the Yine people’s communal lands to seek food and help.
- Families in Monte Salvado earn their income through the sustainable collection and processing of Brazil nuts and murumuru seeds, and by selling handicrafts made from the seeds.

Wildfires push tropical forest loss in Latin America to record highs (Jun 17 2025)
- Recent data from the University of Maryland show the tropics lost 6.7 million hectares (16.6 million acres) of primary rainforest in 2024 — nearly double the loss of 2023 and the highest on record.
- Six Latin American countries were in the top 10 nations for primary tropical forest loss.
- In the Amazon, forest loss more than doubled from 2023 to 2024, with more than half the result of wildfires. Other key drivers include agricultural expansion and criminal networks that increasingly threaten the region through gold mining, drug trafficking and other illicit activities.
- Fire was the leading driver of forest loss (49.5%), destroying 2.84 million hectares (7 million acres) of forest cover in Brazil, Bolivia and Mexico alone.

Protect one large forest, or many small ones? New study reignites conservation debate (Jun 17 2025)
- The scientific community has been divided since the 1970s as to which sort of forest offers more protection for biodiversity: a set of many small patches of forest, or a single large tract?
- A newly published study has rekindled the debate, backing the thesis that large expanses of green space are more important for species conservation, particularly for larger animals that require a more extensive range.
- The debate could help policymakers better direct conservation efforts and funding, but researchers agree that all standing forest, regardless of size, must be protected.

Pandemic-era slump in ivory and pangolin scale trafficking persists, report finds (Jun 17 2025)
- A recent report from the Wildlife Justice Commission analyzed trends in ivory and pangolin scales trafficking from Africa over the past decade using seizure data and found that the COVID-19 pandemic significantly disrupted the illegal trade, with fewer significant seizures reported post-pandemic.
- The report attributes this dip to pandemic-induced lockdowns, increased law enforcement and intelligence gathering, successful prosecutions, and declines in the prices of ivory and pangolin scales.
- While Nigeria has been a major export hub for both commodities, the report finds that trafficking hotspots are shifting to other countries such as Angola and Mozambique, which have historically been hubs of the rhino horn trade.
- The report recommends that African nations strengthen law enforcement and intelligence gathering, dismantle crime networks by targeting those at the top tiers of these networks, and foster better cooperation between countries and other organizations to address trafficking.

Artificial nests help a rare Brazilian parrot bounce back (Jun 16 2025)
Brazil’s red-tailed amazon parrot is a rare success story for reviving a species heading toward extinction, Mongabay Brasil’s Xavier Bartaburu reports. By the end of the 20th century, the population of the red-tailed amazon (Amazona brasiliensis) had dwindled to fewer than 5,000 individuals in Brazil’s Atlantic Forest, one of the most endangered biomes in the […]

Mounting risks due to climate change threaten Sri Lanka’s endemic species (Jun 16 2025)
- Sri Lanka’s isolation during past glacial cycles resulted in the evolution of unique species, but ongoing human-induced climate change now poses a major threat to their survival.
- Using species distribution models, researchers have discovered that montane amphibians and reptiles that are particularly restricted to narrow ecological niches with limited mobility are particularly vulnerable to rising temperatures.
- Species with direct development, like many Pseudophilautus frogs, which bypass the tadpole stage, are especially sensitive to microclimate changes.
- Of the 34 amphibian species confirmed extinct worldwide, 21 were endemic to Sri Lanka, underscoring the island’s fragility and the urgent need for targeted conservation efforts.

No respite for Indonesia’s Raja Ampat as nickel companies sue to revive mines (Jun 13 2025)
- Three companies are suing the Indonesian government to be allowed to mine for nickel in the Raja Ampat archipelago, a marine biodiversity hotspot, Greenpeace has revealed.
- The finding comes after the government’s recent revocation of four other mining permits in the area, following a public outcry over environmental damage and potential zoning violations.
- At the same time, the government is also encouraging the development of a nickel processing plant nearby, raising concerns this could fuel pressure to reopen canceled mines to supply the smelter.
- Greenpeace has called for a total mining ban across Raja Ampat and for an end to the smelter project to ensure the conservation of the archipelago’s unique ecosystems and biodiversity.

It’s time to pay the true value of tropical forest conservation (commentary) (Jun 12 2025)
- Conserving the world’s tropical forests requires large-scale and predictable finance, a new op-ed by Brazilian officials argue in making their case for the Tropical Forest Forever Facility (TFFF), a finance regime that will be discussed at this year’s U.N. climate summit (COP30) in their nation.  
- The TFFF would pay a fixed price per hectare of tropical forest conserved or restored, providing positive incentives aligned with national fiscal planning via a funding model that blends public investment and private market borrowing.
- “The time to act boldly for our forests is now. The TFFF is not only possible — it is essential. We are calling on the world to join us,” they write.
- This post is a commentary. The views expressed are those of the authors, not necessarily of Mongabay.

Mongabay India wins best science podcast at Publisher Podcast Awards (Jun 12 2025)
Mongabay India’s 2024 podcast miniseries “Wild Frequencies” bagged the “Best Science and Medical” category at the Publisher Podcast Awards ceremony in London on June 11. The podcast is a three-episode series that tells stories of how researchers in India use the science of bioacoustics, or animal sounds, to better understand the lives of wildlife, such […]

Top tools to protect rainforests | Against All Odds (Jun 12 2025)
Crystal Davis, Global Program Director at the World Resources Institute, highlights positive strides in rainforest conservation worldwide. From successful protection efforts in Brazil and Colombia to the critical role of Indigenous communities in safeguarding rainforests, we explore how technology, like Global Forest Watch, and strong political leadership are helping to combat deforestation. While acknowledging the […]

Resilient forests are key to ecological, economic and social resilience, report finds (Jun 10 2025)
- Human society depends economically and socially on resilient forests, a new report from the International Union of Forest Research Organizations demonstrates.
- As a result, pushing forests toward collapse threatens human well-being globally, not just in communities in or near forests.
- The report authors recommend approaches for improving forest resilience, including more inclusive governance and remedying power imbalances.
- They also advocate managing for resilience in ways that include social and ecological concerns, not just the extraction of commercial and monetary value from forests.

With offerings in 4 languages, Mongabay’s podcasts expand global reach (Jun 10 2025)
Mongabay now produces podcasts in four languages: Indonesian, English, Spanish and, the latest addition, French. “Producing podcasts in multiple languages is part of our nonprofit news outlet’s strategy to reach people where they are, in the mediums they prefer, and in the language that they use,” Rhett Ayers Butler, founder and CEO of Mongabay, said in […]

Uniting plantations to save Bornean elephants: Interview with Farina Othman (Jun 10 2025)
- Conservationist Farina Othman, a 2025 Whitley Award winner, has been working with endangered Bornean elephants in Sabah, Malaysia, since 2006.
- Since the 1970s, logging, oil palm plantations and roads have reduced and fragmented elephant habitats, increasing contact between the animals and humans; retaliatory killings arising from human-elephant conflict are now among the major threats to the species’ survival.
- Equipped with knowledge of the Bornean elephant’s behavior, Othman works with local communities and oil palm plantations to promote coexistence with the elephants.
- In a recent interview with Mongabay, Othman dives deep into the human-elephant conflicts in the Lower Kinabatangan area, explaining why and how she attempts to change communities’ perceptions of elephants and reconnect elephant habitats.

The reaches, limits and (alleged) biases of feasibility studies and environmental licenses (Jun 6 2025)
- In the last 20 years, EIA has become a factor already incorporated into the strategic planning of countries, where the potential trade-offs arising from environmental and social impacts are of great importance.
- This is how public consultations arise, allowing civil society to have a voice in the appearance of private or public investment. In all the systems of Panamazonia, the principle is the same: the possibility of canceling a project if its negative impacts are unacceptable.
- For Killeen, one of the most obvious conflicts of interest occurs when the construction contract gives the mining company itself responsibility for conducting both the feasibility study and the environmental assessment.
- Likewise, multilateral financial organizations require high-quality environmental studies, but their credit advisors are evaluated by the number of projects managed, not by their ability to reject high-risk projects.