Why Is the Amazon Rainforest Important?

• The world’s largest tropical rainforest is home to 10 percent of the world’s species, and provides us with much of our food.
• Indigenous tribes have called this rainforest region home for thousands of years.
• Due to fires, the Amazon forests may be emitting more carbon dioxide than they are absorbing.

The Amazon rainforest is the world’s largest tropical rainforest and covers more than 2.5 million square miles of land. It stretches across nine South American countries: Brazil, Columbia, Peru, Venezuela, Ecuador, Bolivia, Guyana, Suriname, and French Guiana.

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Because this lush region provides important benefits to communities living near and far, nearly 500 indigenous groups call the Amazon rainforest home. It’s a highly biodiverse ecosystem, home to untold species of plants and animals. The rainforest can create its own weather and influence climates around the world. Unfortunately, the fragile ecosystem faces the constant threat of deforestation, and has seen devastating wildland fires in recent years. As of August 2022, the Brazilian National Space and Research Institute (INPE) recorded 33,116 fire hotspots in the Amazon that month.

So, why is the Amazon rainforest important to the health of our planet? We’ve rounded up four damn good reasons.

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Reason No. 1: Its Abundance of Animals

Curious young male South American Red Howler Monkey in a tree, staring at the camera.

Ger Bosma

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From pond-hopping poison frogs to spotted jaguars slinking around in the dead of night, the Amazon rainforest is important because it houses some of the world’s most charismatic plants and animals. It’s one of the most diverse ecosystems in the world—home to 10 percent of the world’s species, according to the World Wildlife Fund. There are more than 2.5 million species of insects that scuttle through the leaf litter. It contains roughly 1,300 bird species, 3,000 species of fish, and approximately 430 species of mammals, according to .

These animals play an important role in keeping the rainforest healthy. For instance, important nutrients from the carcasses, feces, and food scraps deposited by mammals leech into the forest floor. This nutrient influx instead of releasing it into the atmosphere.

Reason No. 2: Its Wide Variety of Plant Life

A rubber tapper extracting the latex from a rubber tree in the Brazilian Amazon region. This activity is fundamental for local economies and relies on traditional and sustainable practices.

Eduardo Fonseca Arraes

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More than 40,000 plant species have been found in the Amazon rainforest. Many of them have important medicinal uses or are found in the foods we eat. Chocolate, vanilla, cinnamon, pepper, and coffee are grown in the rainforest. Rubber trees produce a sticky, white latex sap that is used in rubber processing and provides a source of income for indigenous communities living in the rainforest.

The Amazon’s plants play an active role in regulating the ecosystem. As plants in the Amazon photosynthesize, they create their own weather. Through a process called transpiration, plants release water vapor from pores along the underside of their leaves. This moisture influx sustains life by seeding thick bands of clouds that keep water locked in the lush forest and flowing into rivers that supply communities downstream.

This phenomenon doesn’t just impact weather in the Amazon. As the rain falls over the forest, warm air rises high into the atmosphere, pulling even more moisture in from the ocean thousands of miles away.

Reason No. 3: The Amazon River’s Riches

Aerial view of the Amazon River

Erik Sampers

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The Amazon River is the second-longest river in the world, next to the Nile. Its winding waterways cover roughly nearly 4,000 miles, according to the U.S. Geological Survey. The Amazon has the highest rate of rainfall in the world, according to . More than 3,700 cubic miles of rainwater fall from the sky each year.

Biodiversity along the Amazon River and its surrounding wetlands is incredibly rich. The winding river is home to numerous species, including red bellied piranha, pancake stingrays, bull sharks, black caiman crocodiles, and the endangered pink river dolphin. A recent study suggested that wetlands in the Amazon hold over 53 percent of the more than 6,727 tree species counted in the Amazon.

Reason No. 4: Its Carbon and Oxygen Cycle

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The Amazon rainforest plays an important part in regulating the world’s oxygen and carbon cycles. It produces roughly 6 percent of the world’s oxygen and has long been thought to act as a carbon sink, meaning it readily absorbs large amounts of carbon dioxide from the atmosphere.

But when trees are logged and the forest is burned, that carbon is released into the atmosphere at alarming rates. Recent research has suggested that these forests might actually be emitting more carbon dioxide than they’re absorbing. Luckily, if we’re able to conserve large parts of the fragile ecosystem, scientists believe we may be able to restore its status as a carbon sink.

Jennifer Leman

Jennifer Leman is a science journalist and news editor at Popular Mechanics, where she writes and edits stories about science and space. A graduate of the Science Communication Program at UC Santa Cruz, her work has appeared in The Atlantic, Scientific American, Science News and Nature. Her favorite stories illuminate Earth’s many wonders and hazards.