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

Largest dam removal ever, driven by Tribes, kicks off Klamath River recovery (Oct 17 2024)
- The largest dam-removal project in history was completed in October, freeing 676 kilometers (420 miles) of the Klamath River and its tributaries in California and Oregon.
- The project involved removing four dams, built between 1918 and 1964 to provide electricity. They had devastating effects on salmon populations and tribal communities, leading to a decades-long, tribe-led movement for their removal.
- The $450 million project involved complex engineering to remove the dams and, now, to restore the river ecosystem, including replanting native vegetation and reshaping the river channel, incorporating tribal knowledge to improve habitats for salmon and other species.
- Experts expect coho salmon to recover in six to 12 years and Chinook salmon in 15 to 20 years in what was once the third-largest salmon producing river in the contiguous U.S.

Amazon voters elect environmental offenders and climate denialists in Brazil (Oct 17 2024)
- The Amazonian population elected climate change deniers and politicians with a history of environmental fines to govern some of the region’s major cities.
- Pará’s state capital, Belém, which will host COP30 in 2025, may elect a mayor unconcerned about climate change.
- According to experts, opposing illegal activities is political suicide in municipalities whose economies rely on deforestation, illegal mining and illegal logging.

Delay of EU Deforestation Regulation may ‘be excuse to gut law,’ activists fear (Oct 17 2024)
- In a surprise move, the European Commission has proposed a 12-month delay in implementation of the EU’s groundbreaking deforestation law, which was slated to go into effect in January 2025.
- The European Parliament still needs to approve the delay, but is expected to do so. The law is meant to regulate global deforestation caused by a range of commodities from soy to coffee, cattle, cocoa, palm oil, rubber and wood products, including industrial-scale wood pellets burned to make energy.
- Commodity companies, including those in the pellet industry, say the law’s certification requirements are onerous and the 2025 start date is too soon for compliance. The industries are supported by commodities-producing nations such as Brazil, Indonesia and the United States (a primary source of wood pellets).
- Forest campaigners, including those opposing tree harvests for wood pellets, fear that delay of the EU Deforestation Regulation (EUDR) will offer commodity companies and exporting nations time to water down the law meant to protect native forests, carbon storage and biodiversity, and delay the worst climate change impacts.

Tiger population census in Bangladesh shows a hopeful upward trend in the Sundarbans (Oct 17 2024)
- The latest tiger population census in Bangladesh, which was done by evaluating camera-trapping data, shows that the country is home to at least 125 adult Bengal tigers.
- The report shows almost a 10% increase since the last census in 2018 in the Sundarbans mangrove forests, which is considered to be Bangladesh’s only remaining habitat for tigers.
- Conservationists attribute this success to the efforts made in the region in recent years, including installing fences and increased patrolling against poaching.

What Indigenous leaders want from the COP16 U.N. biodiversity conference (Oct 17 2024)
- From Oct. 21 to Nov. 1, about 770 Indigenous leaders from around the world are registered to gather at the U.N. biodiversity conference, or COP16, to advocate for the recognition of Indigenous rights as part of the solution to the Earth’s biodiversity crisis.
- Mongabay spoke with several Indigenous delegates attending the conference to gauge what they’re looking for going into the conference.
- The main topics on their agenda include the development of reporting and monitoring mechanisms to ensure Indigenous and traditional peoples’ rights are not neglected in the race to achieve the goals of the Kunming-Montreal Global Biodiversity Framework (GBF).
- Leaders from Guatemala, Colombia, Peru and other countries also plan to push for the creation of a program of work on Article 8(f) and its provisions, direct access to funding and the recognition and titling of Indigenous and local community lands.

Indonesia investigates suspected corruption in palm oil amnesty program (Oct 17 2024)
- Indonesian prosecutors are investigating suspected corruption in the environment and forestry ministry’s management of oil palm plantations.
- Experts suspect the investigation targets a government program aimed at legalizing illegal oil palm plantations within forest areas and the potential underpayment of fines by companies that operate illegal plantations.
- A combined 3.37 million hectares (8.33 million acres) of oil palm plantations are considered illegal under Indonesian law because they were established on land zoned as forest areas.
- In 2020, the government introduced an amnesty scheme through a hugely controversial law that did away with criminal punishment for illegal plantations and their operators, and instead gave them a grace period of three years to obtain proper permits and official rezoning of their operational areas to non-forest areas; operators were also required to pay fines before they could resume operations, but the calculation used to determine those fines is under scrutiny.

Climate change and agrochemicals pose lethal combo for Amazonian fish (Oct 17 2024)
- A recent study evaluates the impacts on the Amazonian tambaqui fish from simultaneous exposure to a mix of pesticides and an extreme climate change scenario.
- Researchers subjected the fish to higher temperatures and higher atmospheric CO2 levels, as well as a cocktail of two pesticides, a herbicide and a fungicide, all of which are commonly used in farms throughout the Brazilian Amazon.
- The tambaqui’s capacity to metabolize the agrochemicals was found to be compromised in warmer water, and they suffered damage to their liver, nervous system and DNA.
- The study also points to the risks to food safety in the region, where fish are the main protein source: some 400 metric tons of tambaqui are eaten every year in the city of Manaus alone.

Search for new territory led Nepal’s ‘low-altitude’ snow leopard to get lost (Oct 17 2024)
- In January 2024, a snow leopard was found far from its usual high-elevation habitat, roaming in Nepal’s eastern plains — a region that’s the turf of the tiger.
- Researchers now conclude that the snow leopard, around 1.5 to 2 years old, likely lost its way during dispersal, a natural process in which young animals leave their birth area to establish their own territory.
- An analysis of the animal’s scat revealed the snow leopard had fed on blue sheep shortly before it was found, suggesting it had come from a higher altitude and ruling out the possibility that it had escaped from captivity.

Thailand’s budding mangrove restoration plans spark both hope and concern (Oct 17 2024)
- Mangrove restoration projects based on mass tree planting have often proved unsuccessful due to a focus on quantity rather than carefully selecting planting sites or prioritizing long-term social and ecological gains.
- Thailand’s state-led and corporate-funded restoration approaches have typically followed this unsustainable model, prompting critics to call for more ecological and community-based approaches that place more emphasis on natural regeneration.
- Several new national initiatives aim to improve mangrove management in Thailand: A collaborative public-private program called the Thailand Mangrove Alliance aims to bring 30% of Thailand’s mangroves under effective management by 2030.
- However, a new carbon credits initiative that aims to link coastal communities with corporate partners has drawn widespread skepticism from environmental groups, who warn the scheme could effectively transform public forests into corporate lands.

Local NGO RAINS brings relief to Ghana’s semiarid north with regenerative farming (Oct 16 2024)
- An NGO in the semiarid north of Ghana is helping farming communities cope with a range of challenges through initiatives that center social and human rights and build on Indigenous knowledge.
- The Regional Advisory Information and Network Systems (RAINS) promotes regenerative agricultural practices to local farmers, including intercropping, the planting of cover crops, and the use of traditional seeds and compost and manure.
- It also engages typically marginalized groups such as women and youth in community land-use planning, and tackles gender inequality by improving women’s access to savings schemes and microcredit.
- Those working with the NGO say its efforts have had a material impact on improving food security and reducing incidents of fires, and express hope for its sustained support.

Brazil elects record-high number of Indigenous mayors, vice mayors & councilors (Oct 16 2024)
- In Brazil, 256 Indigenous people were elected mayors, vice mayors and city councilors, the highest in the country’s history and an 8% increase compared with 236 elected in the 2020 ballot.
- With 1,635,530 votes, Indigenous candidates were the only group that recorded growth in votes this year, compared with candidates who self-declared white, pardo (brown), Black and Asian, which saw a reduction of around 20% altogether, according to a survey from the Articulation of Indigenous Peoples of Brazil (APIB), the country’s main Indigenous association, which used data from the Superior Electoral Court (TSE).
- Increasing representation of Indigenous people elected in municipal ballots is a key move to ensure the fulfillment of Indigenous rights and should pave the way to increase the number of Indigenous people elected in the 2026 state and federal ballots, advocates and activists say.
- However, the municipal election results also showed a gender gap: Indigenous women accounted for just one mayor of a total of nine Indigenous mayors elected, four vice mayors of a total of nine, and 36 of a total of 234 councilors.

The disappearing red ghost crabs of Cox’s Bazar, a conservation crisis in Bangladesh (Oct 16 2024)
- Cox’s Bazar Beach in southeast Bangladesh is known for its vibrant red crab population, which creates a stunning spectacle in the early mornings and late afternoons. However, this natural wonder is now threatened by human activities and environmental degradation.
- Red ghost crabs benefit coastal ecosystems by aerating sand and improving water infiltration, and also as prey species. Their decline threatens the ecosystem health.
- Researchers say a beach management plan is crucial for their protection and restoration. Protected areas like in Kuakata have shown effectiveness in conserving ghost crabs. Raising awareness among local communities is also crucial for successful conservation efforts in Bangladesh.

Forests and the Fate of Civilizations: A Conversation with John Perlin (Oct 16 2024)
- John Perlin’s A Forest Journey explores how forests and wood were fundamental to the rise and fall of civilizations, providing materials for construction, energy, and industry, but also contributing to societal collapse when overexploited.
- The book highlights the recurring pattern of deforestation throughout history, drawing comparisons between ancient civilizations’ mismanagement of forest resources and today’s environmental challenges.
- Hope through forest preservation: Perlin emphasizes that protecting old-growth forests is one of the most effective strategies to combat climate change, urging modern society to learn from the mistakes of the past to avoid further ecological and societal decline.
- Perlin spoke with Mongabay’s Rhett Ayers Butler about his book in a recent interview.

Act now or lose the Pantanal forever (commentary) (Oct 15 2024)
- This year, over two million hectares of the world’s largest wetland, the Pantanal in Brazil, have burned, as agribusiness drains it and climate change dries it, reducing river flows and allowing fires to spread.
- Many species rely on a healthy Pantanal to survive, including 2,000 species of plants, 580 bird species, 271 kinds of fish, and 174 mammal and 57 amphibian species, many of which are endangered or threatened.
- “To truly protect it, we need an immediate halt on further agricultural expansion, major restoration projects for the land which has already burned, and bold global action to slash carbon emissions,” a new op-ed argues.
- This article is a commentary. The views expressed are those of the author, not necessarily Mongabay.

Delays in land titling threaten the conservation success of quilombos in Brazil (Oct 15 2024)
- Titled quilombo territories — traditional Brazilian communities originally formed by runaway enslaved people — have significantly lower deforestation rates, making them crucial for conserving Brazil’s natural biomes.
- However, only 4.33% of all Quilombolas in Brazil have been granted proper land rights.
- Quilombola communities in Alcântara have fought for their land rights since the 1970s, facing displacement and government neglect, but the Brazilian Air Force is pushing for an expansion of the local space center, delaying the recognition of Quilombola land claims.
- Brazil has admitted to human rights violations against the Alcântara Quilombolas, but progress on land titling remains slow and uncertain.