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

Spurred by investor-friendly law, palm oil firms sue to get licenses back (Jan 25 2022)
- Two palm oil companies in Indonesia’s West Papua province are suing the local government to win back their permits that were revoked last year.
- The new filings are the latest wave of litigation in the province since authorities across West Papua’s eight districts revoked the permits of 16 palm oil companies over administrative violations.
- Lawsuits filed by three other companies were thrown out last December and earlier this month, leaving opponents of the palm oil industry hopeful of a similar outcome in the latest case.
- The staunchest opponents of the companies are the Indigenous communities who have long sought official recognition of their ancestral rights to the land and forests that fall within the oil palm concessions.

Young environmentalists ‘plant the future’ in Colombia’s Amazon (Jan 24 2022)
- Young people like Felipe “Pipe” Henao in Guaviare, Colombia, are using tree planting and social media to raise awareness and spread the message of protecting and valuing the environment.
- Colombia’s Institute of Hydrology, Meteorology and Environmental Studies (IDEAM) recorded a nationwide deforestation rate of 171,685 hectares (424,242 acres) in 2020, with Guaviare department in the Amazon being one of the worst hit.
- Despite the damage being done, civil society efforts are already showing gains with efforts like Henao’s.
- His organization alone has connected with more than 150 companies and organizations in and around the town of Calamar and more than 1,800 families, and mobilized more than 1,000 young people to volunteer to clean rivers, protect wetlands and plant more than 60,000 trees.

As Malaysian state resumes log exports, Indigenous advocates warn of fallout (Jan 19 2022)
- Effective Jan. 3, the state of Sabah in Malaysian Borneo has ended a ban on exporting unprocessed logs.
- The ban was put in place in 2018 in a bid to bolster the state’s timber processing industry; critics warn that overturning it will lead to an increase in both legal and illegal logging in the state’s remaining forests.
- Any increase in logging will especially affect the state’s forest-dependent Indigenous communities, including groups that are trying to assert legal rights to their ancestral land.
- The decision to end the export ban comes as the Sabah Forestry Department makes a push to convert 600,000 hectares (1.5 million acres) of degraded forest into timber plantations.

‘Central African Forests Forever’: Meindert Brouwer’s book looks to solutions (Jan 18 2022)
- “Central African Forests Forever” is a new, 17-chapter book by independent conservationist and writer Meindert Brouwer.
- One unique aspect of the book is the author’s focus on how Chinese pioneers in sustainable forest management have put forth solutions to safeguard the rainforests of Central Africa, the world’s second-largest after the Amazon.
- Brouwer’s book is available in French, English, and Chinese, and is free to download online.

Grounded by conflict and COVID, Colombia’s bird tourism struggles to soar (Jan 14 2022)
- In Colombia, the landmark 2016 peace accords with the FARC heralded hopes of ushering in bird-watching tourism in previously inaccessible, biodiverse regions.
- Birding tourism has unique advantages, including dedicated bird-watchers who will pay good money to go to remote locations.
- But the pandemic, protests, and the persistent perception of insecurity has stymied the country’s bird tourism industry from reaching its full potential.

Brazil’s illegal gold rush is fueling corruption, violent crime and deforestation (Jan 14 2022)
- Once the epicenter of the global trade in gold, illegal mining is once again surging across the Amazon.
- Its extraction and trade is not only fueling corruption, money laundering and criminal violence – it is accelerating deforestation in the world’s largest tropical forest, says Robert Muggah, co-founder of the Igarapé Institute.
- Muggah details a range of challenges facing efforts to rein in the gold mining sector. He says political leadership is critical to make progress on the issue: “Absent political will from the top, however, Brazil’s gold chain will continue to resemble the wild west.”

As Indonesia retakes land from developers, conservation is an afterthought (Jan 12 2022)
- President Joko Widodo’s administration announced last week that it was cancelling millions of hectares worth of logging, plantation and mining concessions.
- Environmental activists say this presents an opportunity to conserve these lands, which cover a combined area larger than Belgium, by redistributing them to local and Indigenous communities, and protecting areas still home to rainforest.
- However, some senior government officials say the concessions should be reissued to other companies to develop, and indicate that lands redistributed to communities will also be open to investors.

Despite sanctions, U.S. companies still importing Myanmar teak, report says (Jan 11 2022)
- U.S. timber companies undercut sanctions to import nearly 1,600 metric tons of teak from Myanmar last year, according to a new report.
- Advocacy group Justice for Myanmar said in its report that firms have been buying timber from private companies acting as brokers in Myanmar, instead of directly from the state-owned Myanma Timber Enterprise, which is subject to U.S. sanctions.
- With MTE under military control, Myanmar’s timber auctions have become more opaque, making it difficult to take action against companies circumventing sanctions.

Colombia’s new anti-deforestation law provokes concern for small-scale farmers (Jan 10 2022)
- A new law in Colombia aims to address widespread impunity in cases of environmental crime and curb escalating rates of deforestation.
- The legislation, which took effect last August, comes at a time when deforestation continues to climb in Colombia, where more than 171,000 hectares (423,000 acres) were cleared in 2020.
- Human rights groups and environmentalists have expressed concern that law enforcement may use the new legislation to target vulnerable communities instead of the financiers of deforestation.

Tom Lovejoy’s enduring legacy to the planet (Jan 7 2022)
- Conservation biologist Tom Lovejoy died on Christmas day, 2021 at the age of 80.
- Through his innovative ideas, leadership, and advocacy, Lovejoy leaves an enduring legacy to the field of conservation, writes Jeremy Hance.
- “Among career highlights, Lovejoy published one of the first estimates of global extinction rates in 1980; invented the debt-for-nature swap, a massive boon to conservation areas the world over; he helped raise awareness of the plight of rainforests worldwide, and the Amazon in particular, during the 1980s during the peak save-the-rainforest movement; and he was an advisor to the PBS program, NATURE,” Hance writes.
- “Lovejoy’s work lives on, not only through his fragments project in Brazil, but through years of advising and collaborating with other researchers, celebrities and world leaders, including four US presidents, to preserve the ecological integrity of our natural world.”

Proposal could redefine palm oil-driven deforestation as reforestation in Indonesia (Jan 7 2022)
- Indonesia’s leading forestry university is making the case for oil palms to be classified as a forest crop — a move that would see existing plantations counted as forest, and the establishment of new ones as reforestation.
- The proposal from the Bogor Institute of Agriculture (IPB) also argues that oil palm plantations should count toward Indonesia’s carbon sequestration goals, despite studies pointing out that clearing rainforest for oil palms leads to vast amounts of emissions
- The move has been criticized by other academics and NGOs, who say it could pave the way for the unfettered clearing of Indonesia’s remaining forests.
- They also say that, if accepted by the government, the plan would legitimize the oil palm plantations currently operating illegally inside forest areas.

Podcast: Exploring New Guinea’s extraordinary natural and cultural richness (Jan 5 2022)
- New Guinea is one of the most biodiverse regions on the planet. Making up less than 0.5% of the world’s landmass, it is estimated to contain as much as 10% of global biodiversity.
- The dense mountainous region creates barriers to development and conservation alike, but has contributed to preserving 80% of the island’s forest cover which still remains intact.
- However, experts are worried that extractive industries threaten not just its vast biodiversity but the human knowledge, culture, and livelihood of its original inhabitants, which represent more than 1,000 different languages across the island.
- Mongabay Explores is an episodic podcast series exploring unique people, places, and stories from around the globe in-depth. You may be familiar with our previous seasons on “The Great Salamander Pandemic,” and “Sumatra.”

Community control of forests hasn’t slowed deforestation, Indonesia study finds (Jan 4 2022)
- A new study has found that Indonesia’s social forestry program, which gives local communities access to manage the country’s forests, hasn’t led to a reduction in overall deforestation.
- The study found that forest loss in community-titled forests aimed at conservation actually increased.
- Possible explanations include lack of capacity and resources for communities to manage their forests, as well as lack of financial incentives for them to not clear their forests.

Groups welcome decline in deforestation in Indonesia’s Leuser Ecosystem (Jan 3 2022)
- Indonesia’s Leuser Ecosystem experienced a decline in deforestation in 2021, after an increase in forest loss in 2020 linked to the COVID-19 pandemic, according to a satellite analysis by local forest watchdog HAkA.
- Leuser, known for being the last place on Earth where critically endangered Sumatran rhinos, tigers, elephants and orangutans coexist, lost 4,472 hectares (11,051 acres) of its forests as of November 2021, compared to 7,331 hectares (18,115 acres) in 2020.
- Conservationists attribute the decline to an increase in monitoring efforts as well as greater scrutiny of palm oil producers operating in the landscape, by brands and buyers with zero-deforestation commitments.
- Despite the drop in deforestation, experts warn against complacency, noting that forest clearing is still taking place inside oil palm concessions, and areas of primary forest are still zoned for production, which means they can still be legally cleared.

In round 2 of Philippine geothermal project, tribes dig in for a greater say (Dec 31 2021)
- Mount Apo National Park on the southern Philippine island of Mindanao is home to the country’s highest peak and is also a sacred area for the Manobo Indigenous people.
- Plans in the 1980s to establish a geothermal power plant there faced fierce resistance at first.
- But a royalty agreement with Manobo landowners and a long list of environmental and economic commitments by the plant developer has since seen the project become a model of success.
- Now, tribal leaders say the developer is looking to expand the project onto more ancestral lands, for which the tribes want a greater say in steering governance and development initiatives.