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

Deforestation falls for 8th straight month in the Amazon rainforest, but rises in the cerrado (Dec 8 2023)
- Deforestation in the Brazilian Amazon has decreased for the eighth consecutive month, but damage is rising in the cerrado, a tropical woody grassland that’s adjacent to Earth’s largest rainforest.
- According to data released today by Brazil’s National Space Research Institute (INPE), forest clearing in November totaled 201 square kilometers, brining the cumulative loss for the past twelve months to 5,206 square kilometers – 51% less than last year.
- The decline in deforestation has persisted despite one of the most severe droughts ever recorded in the Amazon.
- However, while deforestation in the Amazon rainforest has decreased, it has reached the highest level in at least five years in the cerrado.

Indigenous groups rebuke court OK for palm oil company to raze Papua forests (Dec 7 2023)
- Indigenous Awyu tribal members in Papua lambasted a court decision that effectively greenlights palm oil company PT Indo Asiana Lestari’s plans to raze 26,326 hectares (65,000 acres) of primary forest that sit on ancestral lands.
- If developed in full, the project would replace 280,000 hectares (692,000 acres) of the third-largest stretch of rainforest on the planet with several contiguous oil palm estates run by various companies.
- The impending deforestation would subsequently release at least 23 million metric tons of carbon dioxide, which is 5% of Indonesia’s estimated annual carbon emissions.

Coca in the Amazon – The anti-development crop (Dec 6 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 and 2024.

How creative & emotive communication conserved 55,000 acres of Peru’s Amazon (Dec 5 2023)
- Protecting the Peruvian Amazon is dangerous work, but conservationist Paul Rosolie and his nonprofit Junglekeepers team have attracted millions of dollars in funding to protect 55,000 acres of rainforest in the country’s Madre de Dios region.
- Rosolie first received international recognition via his 2014 memoir, “Mother of God: An Extraordinary Journey in the Uncharted Tributaries of the Western Amazon.”
- Today, he runs both a nonprofit and an ecotourism service that employs and is co-led by local and Indigenous people.
- In this podcast episode, Rosolie reflects on his decade-plus journey to today and shares his recipe for conservation success.

Local and national food crops in the Andean Amazon (Dec 5 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 and 2024.

Indonesia pushes carbon-intensive ‘false solutions’ in its energy transition (Dec 5 2023)
- Indonesia’s newly revised plan for a $20 billion clean energy transition has come under criticism for offering “false solutions” that would effectively cancel out any gains it promises.
- One of its most controversial proposals is to not count emissions from off-grid coal-fired power plants that supply industrial users without feeding into the grid.
- Emissions from these so-called captive plants alone would exceed any emissions reductions projected under the rest of the Just Energy Transition Partnership.
- The plan also puts a heavy emphasis on “false” renewables solutions such as biomass cofiring and replacing diesel generators with natural gas ones.

Despite progress, small share of climate pledge went to Indigenous groups: report (Dec 4 2023)
- A report from funders of a $1.7 billion pledge to support Indigenous peoples and local communities’ land rights made at the 2021 U.N. climate conference found that 48% of the financing was distributed.
- The findings also show that only 2.1% of the funding went directly to Indigenous peoples and local communities, despite petitions to increase direct funding for their role in combating climate change and biodiversity loss.
- This is down from the 2.9% of direct funding that was disbursed in 2021.
- Both donors and representatives of Indigenous and community groups call for more direct funding to these organizations by reducing the obstacles they face, improving their capacity, and respecting traditional knowledge systems.

Brazil cattle traceability program to limit deforestation in Pará state (Dec 4 2023)
- A new traceability program will keep tabs on the millions of cattle present throughout the state of Pará, in northern Brazil, where the Amazon Rainforest has been hit especially hard by deforestation from cattle ranching.
- The tagging program aims to monitor all transported cattle transported through the state by December 2025 and the permanent herd of approximately 24 million cattle by December 2026.
- The program was created last week through a decree signed by Pará governor Helder Barbalho following the introduction of the Leaders Declaration on Food Systems, Agriculture and Climate Action at COP28, the annual UN climate conference.

What Brazil should have said at COP28 but didn’t (commentary) (Dec 4 2023)
- Brazil’s President Lula made important contributions to COP28 in demanding that the 1.5°C temperature increase limit be respected, in recognizing the risk of Amazon forest collapse, and in promising to end Brazil’s Amazon deforestation by 2030.
- Lula failed to explain how zero deforestation would be achieved, implicitly relying only on the Ministry of Environment’s command and control operations against illegal clearing. The causes of deforestation must be addressed, many of which are being strengthened by the rest of Lula’s presidential administration.
- These include legalization of illegal land claims in government land and highway projects such as BR-319 and associated side roads that would open vast areas of Amazon forest to the entry of deforesters. Brazil’s plans for opening new oil and gas extraction areas and expanding existing ones contradict the discourse on limiting temperature rise to 1.5°C.
- This post is a commentary. The views expressed are those of the author, not necessarily of Mongabay.

Brazil proposes $250 billion “Tropical Forests Forever” fund for rainforests (Dec 3 2023)
- Brazil has proposed a new $250 billion mechanism for conserving the world’s tropical rainforests.
- The “Tropical Forests Forever” fund, sourced from governments and the private sector, would disburse money to tropical countries that achieve set thresholds for limiting deforestation.
- The proposal, conceptually similar to past initiatives, emerges amid a growing interest in nature-based solutions for addressing climate change and other environmental challenges.
- It comes as Brazilian President Luiz Inácio Lula da Silva is repositioning the country as a leader in efforts to address climate change.

Red flags but no repercussions for ‘certified’ Malaysian logger Samling: Report (Dec 1 2023)
- A report by NGOs focused on forests and Indigenous rights in Borneo alleges that Malaysian timber firm Samling has appeared to log beyond the terms of the national forest certification scheme with minimal repercussions.
- An auditor raised several issues with Samling’s FPIC process at certified timber concessions, including one concession that lost its certification and one that has so far retained it.
- One of the report’s authors told Mongabay that they focused the report on auditor SIRIM QAS and Malaysia’s homegrown certification system, in the hope the government can reform the system.
- The report, whose findings Samling and SIRIM QAS have both disputed, highlights ongoing debate about Malaysia’s timber certification process.

Poverty and plantations: Nigerian reserve struggles against the odds (Dec 1 2023)
- Located in southern Nigeria, Oluwa Forest Reserve is supposed to be a bastion for the region’s wildlife – which includes critically endangered Nigeria-Cameroon chimpanzees.
- But the influx of thousands of settlers into the reserve is coming at the cost of its rainforests, with satellite data and imagery showing ongoing clearing into primary forest.
- Palm oil companies are also establishing industrial plantations in the reserve.
- Conservationists and officials warn that vulnerable wildlife populations may be wiped out if forest loss and bushmeat hunting continues at its current rate.

As RSPO celebrates 20 years of work, Indigenous groups lament unresolved grievances (Dec 1 2023)
- The Roundtable on Sustainable Palm Oil (RSPO) held its annual conference in Jakarta to celebrate 20 years of growth and impact — but activists and Indigenous communities say they’ve been waiting years for RSPO to resolve ongoing conflicts and long-standing complaints.
- Indigenous groups and local communities that have lost their lands and forests say the RSPO grievance system has left them without justice or resolution.
- While the RSPO says it has improved its methods of dealing with grievances, affected communities say their complaints have been dismissed for lack of evidence, they have awaited answers for years and their voices aren’t being heard.

Logging, road construction continue to fuel forest loss in Papua New Guinea (Nov 30 2023)
- Papua New Guinea boasts the third largest rainforest in the world and houses about 7% of the planet’s biodiversity, including threatened species found nowhere else in the world.
- In recent years, fraudulent practices in the logging and agriculture industry have resulted in massive forest loss across the country while road network expansion plans threaten to further fragment forests and open them up for resource exploitation.
- Satellite data and imagery show logging activity on the rise in PNG, particularly in the province of Oro.
- Conservationists and officials say forest laws must be tightened in PNG and local communities included in decision-making to reduce forest loss, while incentivizing communities to conserve the remaining forests.

Guatemala braces for unprecedented year of deforestation in Maya reserve (Nov 30 2023)
- Guatemala’s Maya Biosphere Reserve is facing increased pressure from cattle ranching and farming at the same time that droughts threaten to spark an unprecedented wave of fires.
- A tumultuous government transition could also leave environmental agencies without enough funding and resources to keep up with the increased fires, which could further hinder efforts to tackle deforestation.
- The areas that have been traditionally badly hit by deforestation include Laguna del Tigre National Park and Sierra del Lacandón National Park, but there are signs that informal settlers are pushing into new parts of the reserve.