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

Indonesia’s peatland restoration claims in question as fires flare up (Oct 2 2023)
- The Indonesian government says companies have restored 3.7 million hectares (9.1 million acres) of peatland — an area larger than Belgium — in an effort to prevent the annual peat fires.
- But this claim has come into question following an increase in the number of hotspots in peatlands, including inside oil palm concessions that had burned in past years and went up in flames again this year.
- An investigation by The Gecko Project found the government appeared to have inflated the figure of 3.7 million hectares, with the actual figure derived from the government’s own methodology closer to 2.7 million hectares (6.7 million acres).
- Fires on carbon-rich peatlands are a major source of greenhouse gas emissions from Indonesia, which in turn is one of the world’s biggest emitters.

Sumatran province hangs on for late rain as El Niño fires bring heat and sickness (Sep 28 2023)
- Wildfires have returned to Indonesia as the country enters its dry season amid an El Niño year.
- In Palembang city, new respiratory infections will likely soon eclipse the total diagnosed in 2022.
- Meteorology officials expect the monsoon to begin in parts of Sumatra and Borneo islands in October, but warn dry conditions will persist in much of Indonesia until November.

New online map tracks threats to uncontacted Indigenous peoples in Brazil’s Amazon (Sep 27 2023)
- Mobi, a new online interactive map, draws information from public databases, government statistics and field observations to paint a comprehensive picture of the threats that uncontacted Indigenous peoples face in the Brazilian Amazon.
- The exact location of uncontacted communities is deliberately displaced on the map to avoid any subsequent attacks against them from those who engage in illegal activity in or near their territories.
- The tool can help Indigenous agencies deploy more effective protective actions to fend off threats such as diseases and environmental destruction, which can wipe out vulnerable populations.
- Activists hope the platform will help create a vulnerability index that ranks uncontacted populations according to the severity of threats against them, which can promote stronger public policies.

Infrastructure in the Pan Amazon: Public-private partnerships (Sep 27 2023)
- Mongabay has begun publishing a new edition of the book, “A Perfect Storm in the Amazon,” in short installments and in three languages: Spanish, English and Portuguese.
- Author Timothy J. Killeen is an academic and expert who, since the 1980s, has studied the rainforests of Brazil and Bolivia, where he lived for more than 35 years.
- Chronicling the efforts of nine Amazonian countries to curb deforestation, this edition provides an overview of the topics most relevant to the conservation of the region’s biodiversity, ecosystem services and Indigenous cultures, as well as a description of the conventional and sustainable development models that are vying for space within the regional economy.
- Click the “A Perfect Storm in the Amazon” link atop this page to see chapters 1-13 as they are published during 2023.

Experts slam massive ‘discount’ in fines for Indonesian palm oil billionaire (Sep 27 2023)
- Environmental experts have criticized an Indonesian court ruling that extends a palm oil billionaire’s sentence for corruption by just one year while slashing his fines by nearly 95%.
- The country’s highest court of appeal upheld the initial conviction of Surya Darmadi for conspiring with a local official to illegally obtain licenses for his oil palm plantation, but cut his fines from $2.7 billion to just $144 million.
- Experts who testified in Surya’s prosecution say the latest ruling sets a bad precedent for future law enforcement against corruption and environmental crimes in the country.
- And without fines, they warn, there can be no efforts to recover the carbon-rich and biodiverse peat ecosystems in Sumatra that Surya’s plantations destroyed.

Infrastructure in the Pan Amazon – Finance: What is new and what is not (Sep 26 2023)
- Mongabay has begun publishing a new edition of the book, “A Perfect Storm in the Amazon,” in short installments and in three languages: Spanish, English and Portuguese.
- Author Timothy J. Killeen is an academic and expert who, since the 1980s, has studied the rainforests of Brazil and Bolivia, where he lived for more than 35 years.
- Chronicling the efforts of nine Amazonian countries to curb deforestation, this edition provides an overview of the topics most relevant to the conservation of the region’s biodiversity, ecosystem services and Indigenous cultures, as well as a description of the conventional and sustainable development models that are vying for space within the regional economy.
- Click the “A Perfect Storm in the Amazon” link atop this page to see chapters 1-13 as they are published during 2023.

Peruvian Amazon: Wounds remain after 50 years of oil spills on Achuar land (Sep 26 2023)
- Achuar Indigenous people from the community of José Olaya live near sites impacted by oil-related activity in and around their territory. According to reports by Peru’s environmental authority, toxic metals like cadmium, arsenic and lead have been detected in the area.
- Journalists from Mongabay Latam traveled to four areas — Shiviyacu, Forestal, Huayuri and Teniente López — where there were pipelines, puddles of oil, barrels with potential contaminants and oil-covered creeks and plants.
- According to the environmental authority, José Olaya is the location of eight of the 171 “impacted sites” that the Peruvian government has registered so far. There are 3,170 environmental liabilities caused by oil in the rest of the country.

As fires threaten Indonesian forests, actions like agroforestry promotion are needed (commentary) (Sep 25 2023)
- Indonesia contains the world’s third largest swath of rainforest, but the country’s forested areas have been declining sharply each year.
- Alongside the usual causes, fire has also become a significant driver of deforestation: since 2001, fires have accounted for 10% of forest loss, and this trend is currently intensifying amid the El Niño weather phenomenon, which brings drier conditions.
- “Promoting and supporting agroforestry, alongside other sustainable land use practices, can be a powerful step toward preserving Indonesia’s forests, mitigating climate change, and safeguarding the well-being of both local communities and the global environment,” a new op-ed via the country’s Ministry of Finance argues.
- This post is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

How Canada’s growing presence in Latin America is hurting the environment (Sep 22 2023)
- Canada is up for a periodic U.N. review of its environmental and human rights record in Latin America, and activist groups want to make sure the country is held accountable for lacking regulations and oversight.
- The country is a leader in mining and oil investment in the region but doesn’t do enough to protect against deforestation, pollution and human rights violations against local communities, according to a series of reports published by activist organizations.
- The organizations said Canada should implement new regulations to protect environmental defenders and sign onto ILO Convention 169.

Deforestation for palm oil continues in Indonesia’s ‘orangutan capital’ (Sep 22 2023)
- Carbon-rich peatlands continue to be cleared and drained in an Indonesian protected wildlife reserve known as the “orangutan capital of the world,” with 26 kilometers (16 miles) of new canals dug so far in 2023, up from 9 km (5.6 mi) in 2022, according to an investigation by the advocacy group Rainforest Action Network (RAN).
- While new plantations appeared to have not been established yet along the new canal channels, there is a mosaic of illegal oil palm around the locations of the new canal, indicating a future development of palm oil.
- As new canals continue to be dug, deforestation has also picked up, reaching 372 hectares (919 acres) in the first six months of 2023, a 57% increase from the same period in 2022.
- RAN has called on global brands like Procter & Gamble, Nestlé, PepsiCo and Unilever to address the development of new canals and illegal plantations as their supply chains are tainted with illegal palm oil from the wildlife reserve.

Infrastructure in the Pan Amazon: Railroad development (Sep 21 2023)
- Mongabay has begun publishing a new edition of the book, “A Perfect Storm in the Amazon,” in short installments and in three languages: Spanish, English and Portuguese.
- Author Timothy J. Killeen is an academic and expert who, since the 1980s, has studied the rainforests of Brazil and Bolivia, where he lived for more than 35 years.
- Chronicling the efforts of nine Amazonian countries to curb deforestation, this edition provides an overview of the topics most relevant to the conservation of the region’s biodiversity, ecosystem services and Indigenous cultures, as well as a description of the conventional and sustainable development models that are vying for space within the regional economy.
- Click the “A Perfect Storm in the Amazon” link atop this page to see chapters 1-13 as they are published during 2023.

EU bill and new green policies spur progress on Brazil’s cattle tracking (Sep 21 2023)
- Brazilian banks have created new rules for releasing credit to meatpackers and slaughterhouses in Amazonian states in which their clients must implement traceability and monitoring systems by 2025 to show that their cattle didn’t come from illegal deforestation.
- Even the powerful Brazilian Agriculture and Livestock Confederation (CNA) recognizes the cattle tracking demand and proposes a traceability model to the federal government.
- A new study shows that existing cattle companies’ zero-deforestation commitments have reduced Brazilian Amazon deforestation by 15% and that the devastation could be halved by scaling up the implementation of supply chain policies.
- The ideal animal tracking model is individual, but experts defend a middle-of-the-road solution to reduce illegal deforestation based on cross-referencing from inter-ranch cattle transport data and the Rural Environmental Registry (CAR).

‘Lost’ Brazilian holly tree species found again after nearly 200 years (Sep 21 2023)
- After nearly 200 years without a confirmed sighting, a rare Brazilian tree species called the Pernambuco holly has been found in northeastern Brazil.
- The team located four trees, two male and two female, in a forest fragment near a sugarcane plantation in the metropolitan region of the city of Recife.
- The trees live in an area that was once Atlantic Forest, but now less than 7% of its original forest biome remains, mostly in small fragments.
- Researchers plan to search for more trees, protect the rediscovered site, and collect seeds for germination, but say these efforts will be costly.

Infrastructure in the Pan Amazon: Waterway options (Sep 20 2023)
- Mongabay has begun publishing a new edition of the book, “A Perfect Storm in the Amazon,” in short installments and in three languages: Spanish, English and Portuguese.
- Author Timothy J. Killeen is an academic and expert who, since the 1980s, has studied the rainforests of Brazil and Bolivia, where he lived for more than 35 years.
- Chronicling the efforts of nine Amazonian countries to curb deforestation, this edition provides an overview of the topics most relevant to the conservation of the region’s biodiversity, ecosystem services and Indigenous cultures, as well as a description of the conventional and sustainable development models that are vying for space within the regional economy.
- Click the “A Perfect Storm in the Amazon” link atop this page to see chapters 1-13 as they are published during 2023.

EU deforestation-free rule ‘highly challenging’ for SE Asia smallholders, experts say (Sep 20 2023)
- Millions of small-scale farmers in mainland Southeast Asia are at risk of losing access to European forest commodity supply chains unless serious action is taken to help them comply with the new EU deforestation-free regulation, experts say.
- Smallholders produce significant quantities of the region’s forest-related commodities, but many lack the technical capacity and financial capital to meet the hefty due diligence requirements of the new rule.
- Without support for vulnerable communities to comply, experts say farmers could be exposed to land grabbing, dispossession and other abuses, with some left with no choice but to retreat into forested landscapes to eke out a living.
- Sustainability groups, meanwhile, say the new EU rule is an opportunity to move forest commodity sectors toward improved responsibility, sustainability and transparency.