The Amazon rainforest is the world's largest tropical rainforest, a vital hub of life and a key player in Earth's climate, but it faces serious threats.

Key idea: The Amazon's name comes from a historical battle, and its history includes a rich past of large, advanced indigenous civilizations that shaped the landscape.

The name "Amazon" comes from a fascinating story. A Spanish explorer named Francisco de Orellana had a battle with local tribes. He noticed that women fought alongside the men, which was their custom. This reminded him of the fierce female warriors from Greek stories, called the Amazons. So, he named the river and the surrounding area after them.

People have lived in the Amazon for a very long time, at least 11,200 years. For many years, people thought the Amazon could not support large populations because its soil was not very fertile for farming. However, newer discoveries show that the region was actually home to many people in the past. Some estimates suggest that as many as 5 to 8 million people lived there around the year 1500.

These early communities were quite advanced. They even shaped the forest through practices like "forest gardening" and creating terra preta, a very fertile dark soil. This suggests that large parts of the Amazon rainforest might not be entirely natural, but rather the result of centuries of human care and management. Sadly, after Europeans arrived, diseases like smallpox drastically reduced the indigenous population.

Key idea: The Amazon rainforest formed millions of years ago, shaped by geological changes and even fertilized by dust from the distant Sahara Desert.

The Amazon rainforest covers a massive area, and its formation dates back millions of years. It likely began to form around 56 to 33.9 million years ago, when the Atlantic Ocean grew wide enough to bring warm, moist air to the region. This created the perfect conditions for a tropical rainforest to thrive.

Over time, the landscape changed dramatically. For example, the Andes Mountains rose, which created a huge lake in the middle of the continent. Eventually, this water broke through a natural barrier and flowed eastward, forming the Amazon River as we know it today. Even during ice ages, when the climate was drier, the Amazon rainforest managed to survive and continue to evolve its incredible variety of life.

A surprising fact is that more than half of the dust that fertilizes the Amazon rainforest comes all the way from the Sahara Desert in Africa. This dust contains important nutrients like phosphorus, which plants need to grow. Every year, about 22 million tons of this dust, rich in phosphorus, falls over the Amazon basin, replacing the nutrients washed away by heavy rains.

“More than half of the dust fertilizing the Amazon rainforest comes all the way from the Sahara Desert in Africa.”

The Amazon is a hotspot for biodiversity, meaning it has an incredible variety of living things. It is estimated that one in every ten known species in the world lives here. This includes about 2.5 million different kinds of insects, tens of thousands of plant species, and thousands of types of birds and mammals.

To give you an idea of its richness: one in five of all bird species on Earth are found in the Amazon. Also, one in five of all fish species live in its rivers and streams. Scientists have identified at least 40,000 plant species, 2,200 fish species, 1,294 bird species, 427 mammal species, 428 amphibian species, and 378 reptile species in the region. There are also many dangerous creatures, like jaguars, anacondas, electric eels, and poisonous frogs.

Unfortunately, this amazing biodiversity is under threat. The biggest dangers are habitat loss from deforestation and an increasing number of fires. These problems are destroying the homes of countless species and putting them at risk.

Key idea: Deforestation, driven by human settlement and agriculture, is pushing the Amazon towards an irreversible tipping point where it could transform into a savanna.

One of the biggest threats to the Amazon is deforestation, which means clearing forests to use the land for other purposes. This is mainly happening because of human settlements and developing the land for things like farming and cattle ranching. About 20% of the Amazon rainforest has already been cut down, and another 6% is severely damaged.

Scientists warn that if another 0 to 5% of the forest is lost, we could reach a "tipping point." This is a point of no return where large parts of the eastern, southern, and central Amazon could permanently turn into a dry, degraded grassland, similar to a savanna. This change would take decades to fully happen but would be irreversible.

Historically, access to the Amazon's interior was limited, keeping the forest mostly untouched. But in the 1960s, new farms started using "slash and burn" methods. The problem is that Amazonian soils are only fertile for a short time. So, farmers constantly move to new areas, clearing more land and causing widespread environmental damage. A common misconception is that clearing the Amazon for agriculture is always economically beneficial; however, research shows that deforestation actually reduces rainfall and crop yields, leading to economic losses far greater than the value of the goods produced.

“Scientists warn that if another 0 to 5% of the forest is lost, we could reach a 'tipping point' where large parts of the Amazon could permanently turn into a dry, degraded grassland.”

Key idea: Fires, severe droughts, and climate change are intensifying threats to the Amazon, leading to a dangerous cycle of forest degradation and increased greenhouse gas emissions.

Beyond deforestation, the Amazon faces other serious threats. Large-scale fires, often started by humans, are becoming more frequent and intense. For example, in 2019, Brazil saw over 72,000 fires, with more than half in the Amazon. These fires destroy vast areas of forest and harm countless species. The increased fires are often linked to relaxed environmental rules.

Droughts are also becoming more severe. In 2005 and 2010, the Amazon experienced its worst droughts in a century. These droughts kill trees and make the forest more vulnerable to fires. Some studies suggest that about 40% of the Amazon rainforest is at risk of becoming a savanna-like ecosystem due to less rainfall.

Climate change itself is a major threat. The Amazon rainforest plays a huge role in regulating global climate, storing vast amounts of carbon. However, deforestation and fires mean the Amazon is now releasing more greenhouse gases than it absorbs. This speeds up global warming and creates a vicious cycle, as higher temperatures and reduced rainfall further stress the forest.

⚠️Watch out: Many people think the Amazon produces 20% of the world's oxygen. While it produces a lot, it also uses a lot, so its net contribution to global oxygen is close to zero. Its real importance is in regulating rainfall and storing carbon.

Key idea: Conservation efforts, including sustainable economic models and indigenous land protection, are crucial and economically beneficial for the Amazon's future.

Protecting the Amazon rainforest is not just good for nature; it also makes economic sense. Studies have shown that keeping the forest intact and using its resources sustainably, like harvesting fruits or rubber, can be much more valuable than cutting it down for timber or cattle pasture. For example, one hectare of Peruvian Amazon forest was valued at $6,820 if sustainably managed, compared to only $148 if used for cattle.

Many efforts are underway to protect the Amazon. Indigenous communities, who often have the best knowledge of the forest, are crucial in these efforts. They are fighting to protect their lands from destruction. Governments and organizations are also working to create protected areas and implement policies to reduce deforestation. For instance, in 2023, deforestation in the Brazilian Amazon decreased by about 50% due to new government policies.

There is also a growing interest in developing a "forest-friendly economy." This means finding ways to earn money from the forest without destroying it, such as through ecotourism or sustainable agriculture practices like silvopasture (combining trees, forage, and grazing). The World Bank has even proposed a non-deforestation based economic program for the region, estimating that economic losses from deforestation could be seven times higher than the profits it generates.