As Amazonian Wildfire Season Approaches, We Must Protect the Vulnerable Forest
By Daniel Ross
The wildfires that tore across Australia were as devastating as they were overwhelming, scorching some 15 million hectares of land, killing 34 people and more than 1 billion animals. In terms of its apocalyptic imagery — sweeping infernos torching great swaths with unerring speed — Australia's wildfires were hauntingly reminiscent of the fires that roared through the Amazon rainforest over the past year. Indeed, more than 80,000 fires hit the region during 2019, according to the Brazilian government.
Though many months have now passed since global media focused on the unfolding disaster in the Amazon — one of the world's most important carbon sinks — the problem has far from disappeared. Indeed, as the region gears up toward its next Amazon wildfire season, the causes underpinning the problem — like illegal logging, encroachment from agribusinesses and profit-driven government policies — remain very much at play.
And though uncertainty surrounds some of the short- and long-term impacts of increased commercial activity in the Brazilian Amazon, the consequences on a rapidly warming planet are stark indeed. New research suggests that some deforested regions of the rainforest are exhaling more carbon dioxide than they're taking in.
What's more, experts and environmentalists are quick to point the finger of blame toward a principal factor: a government presided over by Brazilian President Jair Bolsonaro, whose tenure has been characterized by aggressive deregulation and increased commercial exploitation of the Amazon's resources.
"The impact is obvious: We have much more deforestation," said Philip Fearnside, an ecologist at the National Institute for Research in Amazonia in Brazil, earlier this year. Even before Bolsonaro took office officially, Fearnside sounded the alarm about the Brazilian president's intentions in the Amazon. And with Bolsonaro well into the second year of his tenure, "he's made good on those promises," Fearnside added.
Indeed, in the year ending on July 30, 2019, more than 10,000 square kilometers of Brazilian Amazon rainforest were lost through deforestation — an amount last topped in 2008, according to Brazil's National Institute for Space Research. The number of active fires in August 2019 was three times higher than in 2018 and the highest number since 2010. The broad ramifications of these trends are far from clear-cut.
According to Jos Barlow, a professor of conservation science at Lancaster University, England, "different fire types have very different behaviors," with varying severities of impact. While "understory" forest fires have the smallest flame heights and burn slowly across the forest floor, for example, "they also have long-lasting impacts, killing around 50 percent of all trees, with mortality occurring for many years after the fire," Barlow wrote in an email.
And so, "How long will it take for forests to recover biomass and primary forest species composition?" Barlow asked. "Will they fully recover, or will they be locked into a lower biomass state?"
Then there's the potential impact on the climate. For the first six months of 2019, deforestation and fires in the Brazilian Amazon released as much as 141 million metric tons of carbon dioxide, according to research led by the Woods Hole Research Center. As César Terrer, a postdoctoral scholar in Earth system science at Stanford's School of Earth, Energy and Environmental Sciences, explains it, the destruction of the Amazon through logging and wildfires means "we're also limiting the potential of current plants to continue storing CO2."
Terrer led a study using anticipated carbon dioxide levels for the end of the century and found that plant biomass should increase by 12 percent as a result — an increase that would help enable plants and trees to store more carbon dioxide. "A 12 percent increase is huge," Terrer said in a phone interview. "For the Amazon in particular, that's more than 15 billion tons of carbon," he added, explaining that this amount is equivalent to "all the carbon stored in all the trees in all the forests" in the United States. "They could store all that additional carbon for free, if we let them be."
The problem? That 12 percent increase is predicated upon current plant biomass levels remaining as they currently are. Instead, "we're increasing deforestation rates in the Amazon, which is hugely important for the climate," Terrer said. "I'm strongly concerned."
After the turn of the century, Brazil appeared to be wrestling the problem of a shrinking Amazon. Between 2004 and 2012, Brazil employed an action plan instituting a number of key provisions, including an expanded network of protected areas alongside market incentives and disincentives, like a successful deforestation moratorium agreed to by nearly all soybean processors and exporters in Brazil. Deforestation rates during that time plummeted.
But 2012 marked a turning point. Since then, deforestation has been ticking upwards — 2016, for example, saw a 29 percent increase.
The administration under Bolsonaro has used that fact to justify its policies in the Amazon, said Fearnside. "There were lots of things happening before Bolsonaro took office, but Bolsonaro has certainly increased that [deforestation] substantially," Fearnside said, pointing to the myriad ways his actions have played out.
The current Brazilian president has taken various measures to weaken the country's environment ministry — the Brazilian Institute of Environment and Renewable Natural Resources (IBAMA) — not least of all by tapping Ricardo Salles to lead it. Salles has called climate change an "innocuous" and "secondary" issue, and has characterized the rate of illegal deforestation in the Amazon as near "zero." The director of Brazil's Space Research Institute was fired when the agency's own calculations — which illustrated a 278 percent increase in deforestation last July — disproved Salles's claims.
The environment ministry has also stepped back its regulatory oversight. Though 95 percent of the deforestation that occurred in the first three months of Bolsonaro's tenure was illegal, no offenders were punished. Indeed, a New York Times analysis found that IBAMA's enforcement actions fell by 20 percent during the first half of 2019, as compared with the year prior. Increased land raids have impacted Indigenous populations in particular.
"President Bolsonaro of Brazil is encouraging the farm owners near our lands to clear the forest," wrote Raoni Metuktire, chief of the Indigenous Brazilian Kayapo people. "And he is not doing anything to prevent them from invading our territory."
Some of Bolsonaro's actions have been met with opprobrium among certain sectors of Brazil's corporate class. Blairo Maggi, a billionaire soybean producer and former agriculture minister, has warned of international condemnation of the government's excursions into the Amazon. "The farmers, associations and industry will have to redo what has been lost," he told The New York Times. "We retreated 10 steps; we will have to work to get back to where we were."
Nevertheless, "there are large parts of the agribusiness that are on the other side," said Fearnside, pointing to the thriving soybean industry in Matopiba, a vast region spanning four Brazilian states. And where is this produce going? In 2017, 92 percent of the soybeans grown for the domestic market in Brazil were used to feed livestock to supply the world's demand for meat.
"The soy farmers there are all on the bandwagon of denying climate change, which is incredible given that climate change is likely to wipe out their soybean business there," Fearnside said.
With Bolsonaro only about one year and a half into his presidency, Fearnside is understandably concerned about his remaining tenure and describes the actions already undertaken as having opened up a Pandora's box. This includes the human health impacts from wildfire-created air pollution on both nearby and distant urban centers — even intensifying glacier melt in the Andes.
Other experts agree with Fearnside. According to Jos Barlow earlier this year, all indications suggested that 2020 would be "even worse." That prophecy is proving true, with deforestation rates currently on pace to surpass last year's.
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By Ana Maldonado-Contreras
- Your gut is home to trillions of bacteria that are vital for keeping you healthy.
- Some of these microbes help to regulate the immune system.
- New research, which has not yet been peer-reviewed, shows the presence of certain bacteria in the gut may reveal which people are more vulnerable to a more severe case of COVID-19.
You may not know it, but you have an army of microbes living inside of you that are essential for fighting off threats, including the virus that causes COVID-19.
How Do Resident Bacteria Keep You Healthy?<p>Our immune defense is part of a complex biological response against harmful pathogens, such as viruses or bacteria. However, because our bodies are inhabited by trillions of mostly beneficial bacteria, virus and fungi, activation of our immune response is tightly regulated to distinguish between harmful and helpful microbes.</p><p>Our bacteria are spectacular companions diligently helping prime our immune system defenses to combat infections. A seminal study found that mice treated with antibiotics that eliminate bacteria in the gut exhibited an impaired immune response. These animals had low counts of virus-fighting white blood cells, weak antibody responses and poor production of a protein that is vital for <a href="https://doi.org/10.1073/pnas.1019378108" target="_blank">combating viral infection and modulating the immune response</a>.</p><p><a href="https://doi.org/10.1371/journal.pone.0184976" target="_blank" rel="noopener noreferrer">In another study</a>, mice were fed <em>Lactobacillus</em> bacteria, commonly used as probiotic in fermented food. These microbes reduced the severity of influenza infection. The <em>Lactobacillus</em>-treated mice did not lose weight and had only mild lung damage compared with untreated mice. Similarly, others have found that treatment of mice with <em>Lactobacillus</em> protects against different <a href="https://doi.org/10.1038/srep04638" target="_blank" rel="noopener noreferrer">subtypes of</a> <a href="https://doi.org/10.1038/s41598-017-17487-8" target="_blank" rel="noopener noreferrer">influenza</a> <a href="https://doi.org/10.1371/journal.ppat.1008072" target="_blank" rel="noopener noreferrer">virus</a> and human respiratory syncytial virus – the <a href="https://doi.org/10.1038/s41598-019-39602-7" target="_blank" rel="noopener noreferrer">major cause of viral bronchiolitis and pneumonia in children</a>.</p>
Chronic Disease and Microbes<p>Patients with chronic illnesses including Type 2 diabetes, obesity and cardiovascular disease exhibit a hyperactive immune system that fails to recognize a harmless stimulus and is linked to an altered gut microbiome.</p><p>In these chronic diseases, the gut microbiome lacks bacteria that activate <a href="https://doi.org/10.1126/science.1198469" target="_blank" rel="noopener noreferrer">immune cells</a> that block the response against harmless bacteria in our guts. Such alteration of the gut microbiome is also observed in <a href="https://doi.org/10.1073/pnas.1002601107" target="_blank" rel="noopener noreferrer">babies delivered by cesarean section</a>, individuals consuming a poor <a href="https://doi.org/10.1038/nature12820" target="_blank" rel="noopener noreferrer">diet</a> and the <a href="https://doi.org/10.1038/nature11053" target="_blank" rel="noopener noreferrer">elderly</a>.</p><p>In the U.S., 117 million individuals – about half the adult population – <a href="https://health.gov/our-work/food-nutrition/2015-2020-dietary-guidelines/guidelines/" target="_blank" rel="noopener noreferrer">suffer from Type 2 diabetes, obesity, cardiovascular disease or a combination of them</a>. That suggests that half of American adults carry a faulty microbiome army.</p><p>Research in my laboratory focuses on identifying gut bacteria that are critical for creating a balanced immune system, which fights life-threatening bacterial and viral infections, while tolerating the beneficial bacteria in and on us.</p><p>Given that diet affects the diversity of bacteria in the gut, <a href="https://www.umassmed.edu/nutrition/melody-trial-info/" target="_blank" rel="noopener noreferrer">my lab studies show how diet can be used</a> as a therapy for chronic diseases. Using different foods, people can shift their gut microbiome to one that boosts a healthy immune response.</p><p>A fraction of patients infected with SARS-CoV-2, the virus that causes COVID-19 disease, develop severe complications that require hospitalization in intensive care units. What do many of those patients have in common? <a href="https://www.cdc.gov/mmwr/volumes/69/wr/mm6912e2.htm" target="_blank" rel="noopener noreferrer">Old age</a> and chronic diet-related diseases like obesity, Type 2 diabetes and cardiovascular disease.</p><p><a href="http://doi.org/10.1016/j.jada.2008.12.019" target="_blank" rel="noopener noreferrer">Black and Latinx people are disproportionately affected by obesity, Type 2 diabetes and cardiovascular disease</a>, all of which are linked to poor nutrition. Thus, it is not a coincidence that <a href="https://www.cdc.gov/mmwr/volumes/69/wr/mm6933e1.htm" target="_blank" rel="noopener noreferrer">these groups have suffered more deaths from COVID-19</a> compared with whites. This is the case not only in the U.S. but also <a href="https://www.washingtonpost.com/world/europe/blacks-in-britain-are-four-times-as-likely-to-die-of-coronavirus-as-whites-data-show/2020/05/07/2dc76710-9067-11ea-9322-a29e75effc93_story.html" target="_blank" rel="noopener noreferrer">in Britain</a>.</p>
Discovering Microbes That Predict COVID-19 Severity<p>The COVID-19 pandemic has inspired me to shift my research and explore the role of the gut microbiome in the overly aggressive immune response against SARS-CoV-2 infection.</p><p>My colleagues and I have hypothesized that critically ill SARS-CoV-2 patients with conditions like obesity, Type 2 diabetes and cardiovascular disease exhibit an altered gut microbiome that aggravates <a href="https://theconversation.com/exercise-may-help-reduce-risk-of-deadly-covid-19-complication-ards-136922" target="_blank" rel="noopener noreferrer">acute respiratory distress syndrome</a>.</p><p>Acute respiratory distress syndrome, a life-threatening lung injury, in SARS-CoV-2 patients is thought to develop from a <a href="http://doi.org/10.1016/j.cytogfr.2020.05.003" target="_blank" rel="noopener noreferrer">fatal overreaction of the immune response</a> called a <a href="https://theconversation.com/blocking-the-deadly-cytokine-storm-is-a-vital-weapon-for-treating-covid-19-137690" target="_blank" rel="noopener noreferrer">cytokine storm</a> <a href="http://doi.org/10.1016/S2213-2600(20)30216-2" target="_blank" rel="noopener noreferrer">that causes an uncontrolled flood</a> <a href="http://doi.org/10.1016/S2213-2600(20)30216-2" target="_blank" rel="noopener noreferrer">of immune cells into the lungs</a>. In these patients, their own uncontrolled inflammatory immune response, rather than the virus itself, causes the <a href="http://doi.org/10.1007/s00134-020-05991-x" target="_blank" rel="noopener noreferrer">severe lung injury and multiorgan failures</a> that lead to death.</p><p>Several studies <a href="https://doi.org/10.1016/j.trsl.2020.08.004" target="_blank" rel="noopener noreferrer">described in one recent review</a> have identified an altered gut microbiome in patients with COVID-19. However, identification of specific bacteria within the microbiome that could predict COVID-19 severity is lacking.</p><p>To address this question, my colleagues and I recruited COVID-19 hospitalized patients with severe and moderate symptoms. We collected stool and saliva samples to determine whether bacteria within the gut and oral microbiome could predict COVID-19 severity. The identification of microbiome markers that can predict the clinical outcomes of COVID-19 disease is key to help prioritize patients needing urgent treatment.</p><p><a href="https://doi.org/10.1101/2021.01.05.20249061" target="_blank" rel="noopener noreferrer">We demonstrated</a>, in a paper which has not yet been peer reviewed, that the composition of the gut microbiome is the strongest predictor of COVID-19 severity compared to patient's clinical characteristics commonly used to do so. Specifically, we identified that the presence of a bacterium in the stool – called <em>Enterococcus faecalis</em>– was a robust predictor of COVID-19 severity. Not surprisingly, <em>Enterococcus faecalis</em> has been associated with <a href="https://doi.org/10.1053/j.gastro.2011.05.035" target="_blank" rel="noopener noreferrer">chronic</a> <a href="https://doi.org/10.1016/S0002-9440(10)61172-8" target="_blank" rel="noopener noreferrer">inflammation</a>.</p><p><em>Enterococcus faecalis</em> collected from feces can be grown outside of the body in clinical laboratories. Thus, an <em>E. faecalis</em> test might be a cost-effective, rapid and relatively easy way to identify patients who are likely to require more supportive care and therapeutic interventions to improve their chances of survival.</p><p>But it is not yet clear from our research what is the contribution of the altered microbiome in the immune response to SARS-CoV-2 infection. A recent study has shown that <a href="https://doi.org/10.1101/2020.12.11.416180" target="_blank" rel="noopener noreferrer">SARS-CoV-2 infection triggers an imbalance in immune cells</a> called <a href="https://doi.org/10.1111/imr.12170" target="_blank" rel="noopener noreferrer">T regulatory cells that are critical to immune balance</a>.</p><p>Bacteria from the gut microbiome are responsible for the <a href="https://doi.org/10.7554/eLife.30916.001" target="_blank" rel="noopener noreferrer">proper activation</a> <a href="https://doi.org/10.1126/science.1198469" target="_blank" rel="noopener noreferrer">of those T-regulatory</a> <a href="https://doi.org/10.1038/nri.2016.36" target="_blank" rel="noopener noreferrer">cells</a>. Thus, researchers like me need to take repeated patient stool, saliva and blood samples over a longer time frame to learn how the altered microbiome observed in COVID-19 patients can modulate COVID-19 disease severity, perhaps by altering the development of the T-regulatory cells.</p><p>As a Latina scientist investigating interactions between diet, microbiome and immunity, I must stress the importance of better policies to improve access to healthy foods, which lead to a healthier microbiome. It is also important to design culturally sensitive dietary interventions for Black and Latinx communities. While a good-quality diet might not prevent SARS-CoV-2 infection, it can treat the underlying conditions related to its severity.</p><p><em><a href="https://theconversation.com/profiles/ana-maldonado-contreras-1152969" target="_blank">Ana Maldonado-Contreras</a> is an assistant professor of Microbiology and Physiological Systems at the University of Massachusetts Medical School.</em></p><p><em>Disclosure statement: Ana Maldonado-Contreras receives funding from The Helmsley Charitable Trust and her work has been supported by the American Gastroenterological Association. She received The Charles A. King Trust Postdoctoral Research Fellowship. She is also member of the Diversity Committee of the American Gastroenterological Association.</em></p><p><em style="">Reposted with permission from <a href="https://theconversation.com/a-healthy-microbiome-builds-a-strong-immune-system-that-could-help-defeat-covid-19-145668" target="_blank" rel="noopener noreferrer" style="">The Conversation</a>. </em></p>
By Jeff Masters, Ph.D.
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