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

The fuel that moves people: the Ecuadorian case (Dec 20 2024)
- In Ecuador, the main areas of colonization were a north-south corridor along the base of the Andes and the Sucumbíos-Orellana quadrant, the country’s major oil-producing region.
- Since the 1970s, populations in both areas have grown significantly. The Andean zone went from 160,000 inhabitants to more than 520,000 in 2017; in parallel, the population in the provinces of Sucumbíos and Orellana increased from less than 12,000 to more than 350,000.
- Colonization also led to the invasion of lands of the indigenous Shuar, which prompted an unusual effort on their part to protect their territory. Today, the area specializes in cattle production and seeks to establish a niche market for high-quality beef for the domestic market.

Brazil’s illegal gold miners carve out new Amazon hotspots in conservation units (Dec 20 2024)
- President Luiz Inácio Lula da Silva’s administration reduced the expansion of illegal gold mining in the Brazilian Amazon, but miners keep finding new sites.
- In 15 conservation units, illegal gold miners destroyed 330 hectares (815 acres) in only two months.
- According to experts, gold miners expelled from Indigenous territories may be migrating to conservation units.
- Alliances with narco mafias and the rise in gold prices are obstacles to fighting illegal mining.

Amazon’s Boiling River gives scientists a window into the rainforest’s future (Dec 20 2024)
- Scientists studying Peru’s Boiling River found 11% fewer tree species for every 1°C (1.8°F) increase in temperature, offering insights into how climate change might affect the Amazon Rainforest.
- The research team discovered that hotter areas not only had fewer species overall but were dominated by heat-tolerant trees that typically grow in the warmest parts of South America.
- The study site is protected by Indigenous Asháninka people as sacred land, but the forest still faces threats from nearby deforestation and fires, reflecting broader challenges across the Amazon.
- The Amazon is experiencing climate pressures, with fire-affected areas in the Brazilian Amazon increasing 18-fold in September 2024, covering a combined area nearly the size of the Netherlands.

Electrochemical removal of ocean CO2 offers potential — and concerns (Dec 20 2024)
- Stripping seawater of carbon dioxide via electrochemical processes — thereby prompting oceans to draw down more greenhouse gas from the atmosphere — is a geoengineering approach under consideration for largescale CO2 removal. Several startups and existing companies are planning projects at various scales.
- Once removed from seawater, captured carbon dioxide can be stored geologically or used commercially by industry. Another electrochemical method returns alkaline seawater to the oceans, causing increased carbon dioxide absorption over time.
- In theory, these techniques could aid in carbon emission storage. But experts warn that as some companies rush to commercialize the tech and sell carbon credits, significant knowledge gaps remain, with potential ecological harm needing to be determined.
- Achieving the scale required to make a dent in climate change would require deploying huge numbers of electrochemical plants globally — a costly and environmentally risky scenario deemed unfeasible by some. One problem: the harm posed by scale-up isn’t easy to assess with modeling and small-scale projects.

South Korea slashes forest biomass energy subsidies in major policy reform (Dec 20 2024)
- In a surprise move, South Korea has announced that it will end subsidies for all new biomass projects and for existing state-owned plants cofiring biomass with coal, effective January 2025, a significant and sudden policy shift.
- Additionally, government financial support for dedicated biomass plants using imported biomass will be phased down, while support for privately owned cofiring plants will be phased out over the next decade. However, subsidy levels for domestically produced biomass fuel remain unchanged.
- The biomass reform is being hailed by forest advocates as a step in the right direction, potentially setting a new, environmentally sound precedent for the region.
- Advocates are now calling on Japan, Asia’s largest forest biomass importer, to follow South Korea’s example.

Coral destruction for toilet construction: Interview with a Malagasy fisher (Dec 20 2024)
- Toamasina, a coastal city in eastern Madagascar, is surrounded by an extensive network of coral reefs that are home to near-threatened species.
- For decades, these reefs have been under threat from an unusual activity: The use of coral in the construction of septic tanks.
- Mongabay spoke with Abraham Botovao, a boat skipper and the president of a local fishers’ association, who has been closely monitoring this trade and its impact on the local marine environment.
- “It frustrates me every time I see them when I’m out fishing, but unfortunately all I can do is watch without being able to do anything,” Botovao said.

Poachers target South Africa’s ‘miracle’ plant with near impunity (Dec 20 2024)
- South Africa has faced a surge in poaching of rare succulents by criminal syndicates since 2019.
- A recent spike in prices paid for a different kind of plant, a drylands-adapted lily, the miracle clivia (Clivia mirabilis), has drawn the attention of plant-trafficking syndicates to the lone reserve where it grows.
- Large numbers of clivias have been seized by law enforcement, raising fears that this rare plant is quickly being wiped out from the limited range where it’s known to occur.
- Reserve staff and law enforcement agencies are underfunded and spread too thinly across the vast landscapes of South Africa’s Northern Cape province targeted by plant poachers.

As lithium mining bleeds Atacama salt flat dry, Indigenous communities hit back (Dec 20 2024)
- The Council of Atacameño Peoples filed a complaint in October 2024 against lithium mining companies operating in Chile’s Atacama salt flat, accusing them of causing the land to sink around their extraction wells.
- The complaint was based on findings from a study published in July that revealed portions of the salt flat are subsiding by up to 2 centimeters, or nearly an inch, per year.
- Scientists warn that one of the main consequences could be the loss of the aquifer’s storage capacity.
- They also point out that since the salt flat lies on a tectonic fault, the subsidence could spread further, including to two protected areas in the region that are home to flamingos and other rare wildlife.

Indonesia’s Indigenous communities sidelined from conservation (Dec 20 2024)
- Research shows that globally, Indigenous peoples are the most effective stewards of their forests and the massive stores of carbon and biodiversity within.
- Yet in Indonesia, which harbors the majority of Earth’s species, Indigenous communities are increasingly sidelined from nature conservation efforts.
- Activists say it is urgent for the Indonesian government to pass a long-awaited bill on Indigenous rights to ensure that Indigenous peoples can contribute to biodiversity conservation without fear of being criminalized or evicted.
- This is especially important, activists say, in light of a new conservation law in Indonesia, which is criticized for not protecting Indigenous land rights; the law also outlines a new form of “preservation area,” where Indigenous activities could be heavily restricted.

Balochistan’s Gwadar city sits at the crossroads of climate and conflict (Dec 20 2024)
- A new study examines the links between conflict and climate in Pakistan’s Balochistan province, where extreme weather can be a threat multiplier.
- The port city of Gwadar serves as an example, as local residents have long had grievances against the state, which were exacerbated by recent flooding that killed several people and displaced hundreds.
- Experts highlight the absence of data-driven policies, citing a gap in research that has hindered solutions; they call for investment in data and the inclusion of local people in decision-making and infrastructure planning.

From Bhutan to Nigeria & Kenya, women endure climate change differently than men (Dec 20 2024)
- Research shows that globally, women and girls suffer greater effects of climate change and environmental disasters than men; at the same time, women environmental journalists often face greater obstacles on the job, and women’s voices are often missing from stories about climate change.
- Three recent Mongabay fellows, all women, report on specific examples from their home countries (Bhutan, Nigeria, Kenya) in which women disproportionately experience the effects of climate change and extreme weather.
- In all three examples, women exhibit a perseverance that ensures their own and their families’ survival — and sometimes aids their own independence and resourcefulness.

For ecological restoration, evidence-based standards deliver better outcomes (commentary) (Dec 20 2024)
- The UN Decade on Ecosystem Restoration has triggered a global movement to rally individual action, financial investment, and political backing to prevent, halt and reverse the loss of nature.
- Evidence-based standards can help meet restoration targets and improve general compliance with laws and regulations while delivering social, environmental and economic net gain for people and nature.
- “As we near the halfway point of the UN Decade on Ecosystem Restoration [the] global application of effective restoration through the use of standards provides a path forward that can help slow climate change and recover ecosystem processes and biodiversity for the future of life on Earth,” a new op-ed argues.
- This article is a commentary. The views expressed are those of the authors, not necessarily Mongabay.

Unlike: Brazil Facebook groups give poachers safe space to flex their kills (Dec 19 2024)
- A new study shows how openly poachers in Brazil are sharing content of dead wildlife, including threatened and protected species, on Facebook.
- It found 2,000 records of poaching on Brazilian Facebook groups between 2018 and 2020, amounting to 4,658 animals from 157 species from all over the country.
- Data suggest there were trophy hunts, meant only to show off hunting hauls rather than being done for subsistence or a consequence of human-wildlife conflict.
- The study highlights the impunity for environmental crimes and the easy dissemination of content related to illegal practices on social media networks in Brazil.

‘Killed while poaching’: When wildlife enforcement blurs into violence (Dec 19 2024)
- In October 2023, Mongabay traveled to Uganda’s Queen Elizabeth National Park as part of a reporting series on protected areas in East Africa.
- While there, we heard allegations that Uganda Wildlife Authority rangers have carried out extrajudicial killings of suspected bushmeat poachers inside the park.
- Two weeks before our visit, a man was shot to death inside the park; his relatives and local officials alleged he was killed by wildlife rangers while attempting to surrender.
- The allegations follow other recent human rights scandals related to aggressive conservation enforcement practices in the nearby Congo Basin.

Most large banks failing to consider Indigenous rights (Dec 19 2024)
- A new report by finance watchdog BankTrack evaluated the policies and practices of 50 major banks and found that most are failing to fully implement adequate safeguards in line with U.N. human rights principles.
- The 2024 report included three new criteria centered around the rights of human rights defenders and Indigenous peoples and the right to a healthy environment; the majority of banks did not explicitly acknowledge environmental rights are human rights and all failed in due diligence around Indigenous peoples’ free, prior and informed consent.
- The report found that small progress has been made in the last two years as banks improve policies and processes for managing human rights.
- The authors say stronger human rights due diligence laws could be a game changer in driving corporate respect for human rights.