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

What have we learned from 15 years of REDD+ policy research? (analysis) (Mar 7 2025)
- The Reducing Emissions from Deforestation and Degradation program (REDD+) is supposed to provide participating countries, jurisdictions and communities in the Global South with incentives to protect their forests.
- This analysis draws on more than a decade of comparative research and identifies a broad array of actors involved in REDD+, with large power differences between them. The authors argue that the power imbalances among these groups are obstructing progress toward shifting away from “business-as-usual” deforestation in the tropics.
- The ambition for sustainable forest “transformation” is at risk of being co-opted by those who stand to benefit from maintaining the status quo, and the authors say it is therefore important for the research community to keep asking what proposed reforms and changes may represent, and whom they serve.
- This article is an analysis. The views expressed are those of the authors, not necessarily of Mongabay.

New species of parrot snake described in Brazil’s threatened Cerrado (Mar 6 2025)
A new species of parrot snake lay undetected for nearly nine years in a scientific collection in Brazil. It closely resembled related species with bright green and yellow tones. But one detail set it apart: a bold black stripe running across its snout, like a mustache. When scientists took a closer look, they suspected it […]

Mangroves at risk as El Salvador begins work on new airport (Mar 6 2025)
- Officials broke ground last week on the Airport of the Pacific near the coastal town of La Unión, in eastern El Salvador, where mangrove ecosystems support wildlife and prevent coastal erosion.
- While the project could bring thousands of jobs to an undeveloped part of the country, it could also lead to massive development where coastal habitats currently protect drinking water for local communities.
- The airport is part of President Nayib Bukele’s plan to invest over a billion dollars into the eastern side of the country.

Forest biomass growth to soar through 2030, impacting tropical forests (Mar 6 2025)
- The forest biomass industry — cutting forests to make wood pellets to be burned in power plants — will continue booming through 2030, says a new report. By then, pellets made in the U.S., Canada, EU and Russia could top 31 million metric tons annually, with those made in tropical nations surging to over 11 million tons yearly.
- The U.K. and EU are forecast to go on burning huge amounts of pellets (more than 18 million metric tons each year by 2030). But Asia will burn even more (27 million tons), with Japan and South Korea expanding use, as Taiwan enters the market.
- Scientists warn that forest biomass burning is unsustainable and produces more CO2 emissions than coal per unit of energy generated. Pellet-making is contributing to deforestation and biodiversity loss in North America, and will increasingly do so in tropical nations, including Vietnam, Brazil, Indonesia and Malaysia.
- Forest advocates continue campaigning against biomass for energy, achieving some hard-won victories. Enviva, the world’s largest biomass producer, went bankrupt in 2024, while South Korea and Japan have taken first steps to reduce subsidies for wood pellets. But the U.K. continues offering millions in subsidies to biomass power plants.

Yaku Raymi: The Quechua Ritual to Save a Glacier (Mar 6 2025)
SANTA FE, Peru — What happens when a glacier dies? In the community of Santa Fe, in Peru, water is disappearing, animals are dying due to a lack of pasture and rainfall has become sporadic. The community members know that climate change is affecting the apu, or mountain god, but they say that transforming a […]

Ugandan researcher wins ‘Emerging Conservationist’ award for work on golden cats (Mar 6 2025)
- Ugandan conservationist Mwezi Badru Mugerwa has been awarded the Indianapolis Prize’s Emerging Conservationist Award for 2025.
- Mugerwa has dedicated the past 15 years working with local communities to stop the poaching of the African golden cat (Caracal aurata), a species endemic to West and Central Africa.
- He and his team at conservation organization Embaka are also using camera traps and artificial intelligence tools to monitor and survey the population of the species, and to gauge the impact of their work.

New setbacks for Peruvian Amazon reserve put uncontacted tribes at risk (Mar 6 2025)
- Since 2003, Indigenous organizations have been calling for the establishment of Yavarí Mirim, an extensive reserve for hundreds of isolated Indigenous people in the Peruvian Amazon.
- The reserve is heavily disputed by extractive industries for its logging and oil and gas drilling potential.
- Experts are concerned that a recent delay will endanger Indigenous groups, as their territory is increasingly encroached on by loggers and illegal drug traffickers.

In the drylands of northern Kenya, a ‘summer school’ for young researchers (Mar 6 2025)
- In northern Kenya’s Isiolo county, young researchers who study pastoralism gathered for a week of training and lectures.
- Most of the researchers were from East Africa; many were themselves raised in pastoralist communities.
- Isiolo county, a semiarid rangeland where most people make their living herding livestock, has been hit hard by drought in recent years.
- The researchers said they wanted to change the “old narrative” about pastoralist communities and their relationship to the environment.

Facing possible eviction, North Sumatra farmers contest palm oil giant (Mar 6 2025)
JAKARTA, Indonesia — An Indonesian palm oil company suspended evictions of several hundred farmers from the northern Sumatra subdistrict of Aek Kuo following an eleventh-hour court reprieve.   On Feb. 20, a local court issued an eviction order authorizing PT Sinar Mas Agro Resources and Technology (SMART) to establish an oil palm plantation on 83.5 […]

Indonesian court blocks palm oil expansion, but leaves Indigenous land rights in limbo (Mar 6 2025)
- Indonesia’s Supreme Court has upheld the government’s decision to block further expansion of the Tanah Merah oil palm project in Papua, preserving a Jakarta-sized swath of primary rainforest.
- The ruling strengthens the forestry ministry’s authority to halt deforestation and was influenced by testimonies from the Indigenous Awyu tribe, who rely on the forest for survival.
- While the decision prevents further clearing, it doesn’t grant Indigenous land rights to the Awyu, leaving the tribe vulnerable to future displacement.
- Other companies are vying for control over concessions within the Tanah Merah project, fueling further conflicts and prompting Indigenous groups to seek formal land rights recognition.

‘Without us, no scrutiny’: Indonesia’s independent media count cost of US funding cuts (Mar 6 2025)
- U.S. funding cuts abruptly ended reporting initiatives on environmental issues in Indonesia, affecting independent journalism outlets like Remotivi, New Naratif and Project Multatuli.
- The loss of nearly $270 million in global journalism support leaves independent media scrambling to cover environmental and human rights issues.
- Shrinking newsroom budgets and government restrictions have already weakened investigative journalism in Indonesia, now worsened by the U.S. aid cuts.
- Facing uncertainty, media groups are pushing to diversify revenue streams and reduce reliance on foreign grants to sustain independent reporting.

Liberia to start industrial shrimp fishing, worrying artisanal fishers (Mar 5 2025)
- Liberia plans to expand industrial bottom trawling in the country by authorizing a new fishery for high-value shrimp.
- However, the government has released few details about the plan, including how much shrimp it will allow the new fishery to exploit, when the trawling would begin, or how it would be regulated.
- The country’s umbrella organization for artisanal fishers casts the move as a threat to the livelihoods, safety and food security of Liberia’s more than 57,000 artisanal fishers, as well as to the country’s marine life.

‘Misguided & lazy’ staff cuts at NOAA will hurt global science, experts warn (Mar 5 2025)
The Trump administration recently fired roughly 800 probationary employees from the U.S. National Oceanic and Atmospheric Administration (NOAA). Former NOAA workers warn that these cuts will have global repercussions, affecting nations and industries that rely on NOAA’s freely available data. NOAA collects and shares data, from the depths of the ocean to outer space and […]

Researchers track Florida’s crocodiles to increase acceptance amid urbanization (Mar 5 2025)
Researchers in Florida, U.S., have attached satellite transmitter tags on 15 crocodiles to learn more about their movement patterns in urbanized areas. Through the multi-year study, the Florida Fish and Wildlife Conservation Commission (FWC), aims to better understand the behavior of American crocodiles (Crocodylus acutus) to help minimize human-wildlife conflict. Native to south Florida and […]

Clash of worlds for the Amazon’s Cinta Larga: Interview with author Alex Cuadros (Mar 5 2025)
- Journalist Alex Cuadros’s latest book, “When We Sold God’s Eye: Diamonds, Murder, and a Clash of Worlds in the Amazon” tells the story of how an Indigenous group in Brazil was forced to reckon with Western culture.
- In an interview with Mongabay, Cuadros says the Cinta Larga group were introduced to Western tools and concepts by the Brazilian state, ultimately eroding part of their lifestyle.
- In a short period of time, the group began to experience money, violence, illegal logging, and mining, while some members of the Cinta Larga profited from these activities.
- “When prospectors started moving into their territory, the Cinta Larga sought them out because they were curious and wanted metal tools,” Cuadros said when explaining the complex relationship with invaders and the “outside” world.