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

Paying to prevent deforestation is positive, not ‘nothing’ (commentary) (Apr 24 2025)
- Should the world pay people to refrain from their destroying forests, a new commentary asks?
- There is something inherently uncomfortable about paying someone to do ‘nothing’ like not cut down their rainforest, but in reality, the value of these places’ ecosystem services and climate regulation is not much different from dividends shareholders earn by owning stocks.
- “By compensating landholders for the services their forests provide, we recognize their true value and offer a pragmatic response to deforestation, biodiversity loss, and climate change,” the author argues.
- This article is a commentary. The views expressed are those of the author, not necessarily Mongabay.

Mexican government looks to correct Tren Maya environmental damages (Apr 22 2025)
- Environment Minister Alicia Bárcena said the government is considering ways to correct some of the damage done by Tren Maya to cenotes and rainforests in the Yucatán peninsula.
- Officials want to remove fencing along the tracks, create new protected areas and ban the construction of additional roads connecting the train with harder-to-reach tourism activities in rainforests.
- At the same time, the government plans to expand the Tren Maya route and build several other trains across the country that could threaten protected areas.

Earth Day: The wonder of iconic satellite images (Apr 22 2025)
There’s something about viewing Earth from space — the shift in perspective has for decades moved us emotionally, scientifically, and philosophically. The iconic Earthrise image of our planet rising above the lunar horizon, taken in 1968 by astronauts aboard the Apollo 8 mission, is widely credited with fueling the environmental movement that led to the […]

Earth Day check-in: Planetary boundaries in peril (Apr 22 2025)
Scientists have identified nine planetary boundaries that help regulate a livable planet. Human activities have pushed six of those nine critical Earth systems beyond safe limits, threatening the stability of life as we know it. Mongabay has consistently reported on all nine systems: Climate change, largely driven by fossil fuel emissions, is causing sea level […]

Indonesia strengthens forest monitoring with new tool to meet EU deforestation law (Apr 21 2025)
- Indonesia is stepping up traceability efforts to comply with the EU Deforestation Regulation (EUDR), which bans imports of deforestation-linked commodities like palm oil, timber and coffee starting in December 2025.
- A new platform, Ground Truthed.id (GTID), combines field-based evidence and geolocation data to detect and document environmental violations in real time, offering a bottom-up alternative to satellite-reliant systems.
- GTID emphasizes collaboration with Indigenous peoples, civil society and law enforcement, using a verification process to turn grassroots reports into legally actionable cases.
- The platform is expected to complement a government-run traceability dashboard by acting as an independent watchdog, helping prevent illegally sourced or conflict-ridden products from entering international supply chains.

Armed groups, cattle ranchers drove 35% rise in Colombia’s deforestation in 2024 (Apr 18 2025)
- Colombia lost 1,070 km² (413 mi²) of forest in 2024, according to data from the country’s environment ministry, representing a 35% increase from 2023.
- Illegal agriculture is thought to be the main driver behind this increase, with cattle ranching spreading inside national parks.
- The environment ministry notes that despite the increase in deforestation last year, the 2024 figure is still one of the lowest in the past 23 years.
- However, experts fear that the increase will continue in 2025 and that armed groups will continue to strengthen their hold over the Colombian Amazon, hindering the progress of conservation strategies with communities.

Locals, researchers race to save unique biodiversity of PNG’s Torricellis (Apr 18 2025)
Torricelli Mountains, a tiny mountain range in northern Papua New Guinea, is estimated to host roughly 4% of the world’s known species, many found nowhere else on Earth, Mongabay’s John Cannon reported in March. “I mean, for 0.003% of the world’s land area — it’s a ‘wow’ factor for me,” Jim Thomas, CEO of the […]

New refuge helps protect Amazon’s most endangered monkey, but gaps remain (Apr 18 2025)
Brazil designated a refuge twice the size of Manhattan near the Amazonian city of Manaus in June 2024 to protect the pied tamarin, South America’s most endangered monkey. But almost one year later, the 15,000-hectare (37,000-acre) reserve is still being implemented institutionally, and conservationists say it falls short of what the species needs to survive. […]

Nature on the move: How conservation must adapt to survive (Apr 18 2025)
Resilience means getting through something — tough, messy, with losses, but surviving. So said Andrew Whitworth, executive director of Osa Conservation in Costa Rica, summing up a growing shift in conservation thinking. As the planet hurtles toward a future 3-5° Celsius (5.4-9° Fahrenheit) warmer by 2075, holding the line is no longer enough. The goal […]

Why conservation research findings are rarely surprising (Apr 16 2025)
Founder’s Briefs: An occasional series where Mongabay founder Rhett Ayers Butler shares analysis, perspectives and story summaries. “We already knew that.” I frequently receive complaints from readers about findings in scientific papers being commonsense or obvious. And yes, it’s true: science often confirms what we’ve long suspected or seen in practice. By its nature, science […]

2 Mongabay podcasts shortlisted for 2025 Publisher Podcast Awards (Apr 16 2025)
Podcasts from Mongabay and Mongabay India have been shortlisted in two categories of the 2025 Publisher Podcast Awards. Media Voices, the weekly publication behind the award, announced the shortlist for the Publisher Podcast Awards last week. Episodes from Mongabay Explores, hosted by Mike DiGirolamo, and Mongabay India’s Wild Frequencies were both shortlisted in the “Best […]

Endangered Chilean frogs thrive in London while waiting out deadly fungus (Apr 15 2025)
A total of 86 Darwin’s frogs are being housed at London Zoo to keep them safe from a deadly infectious disease that has affected over 500 amphibian species worldwide. In October 2024, conservationists from the Zoological Society of London, the NGO Ranita de Darwin and other partners rescued 53 southern Darwin’s frogs (Rhinoderma darwinii) from […]

‘Heart of Borneo’ dams raze Indigenous forests for Indonesia green energy drive (Apr 14 2025)
- A joint venture between Indonesia and state-owned Malaysia companies is constructing a network of dams in the Bulungan and Malinau districts of North Kalimantan, a sparsely populated Bornean province bordering the Malaysian state of Sarawak.
- The dams will generate 9,000 megawatts to power industry in the under-construction Kalimantan Industrial Park Indonesia in Bulungan district, a site the government hopes will be a global hub of solar panel and battery manufacture.
- One community of around 28 families has already been relocated as dam contractors prepare to submerge more villages and tunneling continues.

Mongabay investigation spurs Brazil crackdown on illegal cattle in Amazon’s Arariboia territory (Apr 11 2025)
- An ongoing Brazilian government operation launched in February has removed between 1,000 and 2,000 illegal head of cattle from the Arariboia Indigenous Territory in the Amazon Rainforest.
- In June 2024, Mongabay published the results of a yearlong investigation, revealing that large portions of the Arariboia territory have been taken over for commercial cattle ranching, in violation of the Constitution; the project received funding and editorial support from the Pulitzer Center’s Rainforest Investigations Network.
- “Your report is very similar to what we’re actually finding in the field. It showed an accurate reality and this helped us a lot in practical terms,” Marcos Kaingang, national secretary for Indigenous territorial rights at the Ministry of Indigenous Peoples, told Mongabay in a video interview.
- The investigation also revealed details that authorities said they hadn’t been aware of, including the illegal shifting of the territory’s border markers, Kaingang said: “We brought it up as an important point in our discussions and we verified that the [markers] had in fact been changed.”

Nepal farmers regret planting government-hyped eucalyptus (Apr 9 2025)
In the late 1970s, Nepal launched a reforestation project to restore its massively deforested lands in the southeastern Terai landscape. However, the main tree of choice, eucalyptus, after showing initial signs of success has now proven detrimental to the region’s soil moisture and fertility, Mongabay contributor Mukesh Pokhrel reported in February. To prepare for the […]