The Amazon Rainforest Was and Still Is On Fire

The COVID-19 pandemic has increased the dangers that threaten the Amazon rainforest

The Amazon rainforest during “fire season.” diversityphotos. CC BY-NC-ND 2.0

There are a multitude of dangers ranging from climate change to human destruction that threaten the fragility of the Amazon rainforest. The destruction of the Amazon is largely attributed to consumerism and the extraction of natural resources. Without the existence of the Amazon, the world loses a crucial contender in the fight against climate change along with the likely deaths of many Indignenous people and already endangered species.

Reports from Brazil’s National Institute for Space Research recorded 2,248 fires last month, a 13-year high and a 20% increase over the norm. Last year around this time, there were about 1,880 fires. However, the worst is likely yet to come as burnings in the Amazon tend to increase until September, the end of “fire season.” 

In 2019, the greatest destruction of the fires correlated with the peak of fire season. The increase in the number of fires was likely fueled by President Jair Bolsonaro’s decision to decrease the fines for environmental violations. It gave more leeway for commercial groups and loggers to disregard regulations that help preserve the Amazon. Bolsonaro has been nicknamed “Captain Chainsaw” for his policies that prioritize development over conservation. In an interview, Bolsonaro stated that “the Amazon belongs to Brazil,” so it can do as it wishes with it. As a result, it was estimated last year that every minute, a portion of the Amazon equal to the size of a soccer field was lost due to deforestation. 

The process of deforestation results from loggers trying to clear land as quickly as possible. That includes the use of chainsaws to cut down lumber for manufacturing and development. Then, farmers burn the downed trees that remain to make room for crops and pastures. Fire season, then,is the mark of when farmers begin to set these fires. It is important to acknowledge this is not a new practice, but an unending cycle of extracting from the land without replenishing it. 

Another sign of deforestation in the Amazon. rosamariavidal. CC BY-NC-ND 2.0

A similar phenomenon is occurring this year due to the lack of authority in the Amazon. Just as with last year, many of the fires started so far have been due to illegal loggers. For instance, in the first four months of 2020, deforestation rose by 55% due to a lack of governmental enforcement as Brazil’s attention focused on combating COVID-19.

The spread of COVID-19 also caused many activists and field agents to pull out of the region. As a consequence of the lack of protection by field agents and thin numbers of police, loggers and miners have been able to overtake the Amazon. To show the magnitude of this problem, April’s extent of deforestation was 64% higher than that in April 2019. 

Due to international outcry last year over the fires, President Bolsonaro was forced to deploy enforcement to help monitor the fires and enforce regulations. Most new enforcement agents were unable to be deployed for this year’s fire season, though, due to COVID-19. And to make matters worse, the authority of troops currently in the Amazon expired on June 10, so there is currently no one monitoring fire conditions. 

Eva Ashbaugh

is a Political Science and Gender, Sexuality, and Women's Studies double major at the University of Pittsburgh. As a political science major concentrating on International Relations, she is passionate about human rights, foreign policy, and fighting for equality. She hopes to one day travel and help educate people to make the world a better place.

Amazon Trees Write Autobiographies – Preserving Human History in Their Wood

Tropical forests are one of the world’s largest carbon stores and they help regulate the global climate. But they’re being erased at a terrifying rate. Deforestation claimed an area the size of Belgium in 2018. These habitats are often cleared to make way for palm oil plantations and grazing pasture for livestock. For most forests, destruction on this scale is a fairly modern phenomenon.

Tropical forest ecosystems tend to have very high biodiversity, but often in the places you’d least expect. Research has found that there is often more wildlife in areas where there is an ancient history of human activity.

So how have indigenous people in tropical forests nurtured biodiversity in tropical forests while still domesticating tree species, building cities and growing crops? New research published in Trends in Plant Science suggests that the answer may be written in the trees themselves.

Ancient time capsules

Over 50,000 years ago, people in Borneo managed tropical forest vegetation using fire. They burned the edge of advancing forests, and this targeted disturbance was enough to prevent a large number of tall tree species dominating. It allowed habitats to regenerate that were rich in wild food plants and attractive to the animals that people hunted.

Other traditional methods of forest management included opening the forest canopy by carefully selecting trees to cut down. The light that flooded to the forest floor could then encourage edible species such as wild yams to grow amid the regenerating vegetation. These practices are similar to the modern ideas of edible forests and agroforestry, which maintain relatively high biodiversity and retain soil carbon and nutrient stores. Much of this is lost upon conversion to industrial plantations or ranches.

Traditional forest management encouraged biodiversity, whereas modern methods erode it. Caeteno-Adrade et al. / Trends in Plant Science

In the past, vast areas of the world’s tropical forests were managed by indigenous peoples in this way. Trees keep their own accounts of this history in their wood. It has always been thought that tropical trees have short lifespans, usually less than 400 years. But recent research shows that many tropical trees live for a very long time, and can preserve over 1,000 years of history in their timber.

You’re probably familiar with the idea that you can measure how old a tree is by counting the rings beneath its bark. One ring usually equates to one year, so dendrochronology (the study of tree rings) offers a fairly easy way to understand the life of a tree. Thicker rings tend to denote a year when conditions were good for growth – ample sunshine and water – whereas thinner rings suggest a lean year of drought and competition with other trees.

Many tropical trees don’t lay down annual rings, but in the new study dendrochronologists identified over 200 species that do. Typically wider rings reflect higher rainfall, but many trees put on a growth spurt if light intensity rises. These are called release events and can happen if trees around them are cut down, allowing more light to break through the canopy. Finding these markers helps researchers to recognise and date past episodes of forest clearance. In the Amazon, these records help scientists understand the enormous extent of pre-Columbian agriculture and forest management.

Researchers extract a core of wood to measure the tree’s rings and find out its age. Victor Caetano-Andrade

The rings also preserve evidence of changes in the climate through the different isotopes (types) of oxygen and carbon laid down in the wood. Carbon isotopes tend to reflect light availability and other factors that control photosynthesis, whereas oxygen isotopes help scientists track changes in a nearby water source and annual rainfall. Isotopic studies showed that the abandonment of Angkor Wat in the 14th century coincided with severe drought.

Forest histories can also emerge from new DNA studies. Heavily logged species go through what we call “genetic bottlenecks”, where part of the genetic material of a species is lost as many individuals die or are unable to reproduce and pass on their genes. This leads to restricted gene pools.

Researchers would expect to see the same patterns in species which were strongly affected by logging or fires started by people in the past. Genetics can also identify species that were spread by ancient people, like the Brazil nut.

Living tropical trees record within themselves a history of human activity and the forest’s response to it. The regeneration of forests after disruption by people in the past offers some hope for the future, but only if current rates of deforestation can be halted, allowing the lungs of our planet to regenerate.

Chris Hunt is a Professor of Cultural Palaeoecology, Liverpool John Moores University

THIS ARTICLE WAS ORIGINALLY PUBLISHED ON THE CONVERSATION