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Published Research In Nature Shows That Leaving Tropical Areas Deforested In Peace Can Restore Biodiversity, Reduce Reforestation Costs, And Help Countries Combat Climate Change In A Sustainable Way
Forests have always been described as the lungs of the planet, capable of absorbing carbon from the atmosphere and returning balance to life on Earth. Yet, over the decades, these essential ecosystems have been rapidly reduced, replaced by agricultural areas, expanding cities, and extensive clearings without vegetation. The result is a global scenario of increasing concern regarding climate and biodiversity loss.
In light of this situation, tree-planting campaigns and promises of billions of seedlings have gained prominence as a response to the environmental crisis.
However, a new study published in the journal Nature indicates that the solution may be simpler and quieter than one might think.
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According to the researchers, nature itself has the capacity to recover on a large scale, as long as it is given enough space and time.
The Potential Of Natural Regeneration
The study indicates that up to 530 million acres of deforested tropical land, an area larger than Mexico, could regenerate naturally if left free from human interference.
This regeneration would have a significant impact on combating climate change, with the potential to absorb 23.4 gigatons of carbon over 30 years.
In addition to carbon capture, the benefits extend to other environmental dimensions.
The natural recovery of forests can restore biodiversity, improve water quality, and contribute to the stabilization of local climates, strengthening ecosystems that have long been under constant pressure.
For Brooke Williams, from Queensland University of Technology and the Institute for Environmental Decision Making, investing in this path is also an economic choice.
“Tree planting in degraded landscapes can be costly. By leveraging natural regeneration techniques, countries can meet their restoration goals in an economically viable way,” she stated.
According to her, the model developed by the study helps identify where these savings can be best utilized.
Key Countries In Silent Recovery
The survey points out five countries that concentrate more than half of this regeneration potential: Brazil, Indonesia, China, Mexico, and Colombia.
These nations possess extensive tropical areas and favorable ecological conditions, such as high levels of carbon in the soil and proximity to remaining forests.
These factors make these regions especially conducive to large-scale regeneration. The presence of nearby forests facilitates seed dispersion and the gradual return of species, creating a continuous recovery process that occurs almost unnoticed.
Forests Observed From Space
The study is the result of decades of research in remote sensing and ecology. Matthew Fagan, an environmental systems specialist at the University of Maryland, was involved in developing the dataset used.
He explains that satellite images were used to identify millions of small areas where tree cover has increased over time.
“We used satellite images to identify millions of small areas where tree cover has increased over time,” said Fagan.
According to him, areas planted by humans were excluded with the help of machine learning, allowing the focus to remain exclusively on natural growth.
The research analyzed changes in tree cover between 2000 and 2012 and checked if these forests continued to exist until 2015.
From there, a predictive model was created with a resolution of only 30 meters (98 feet), where each pixel represents the likelihood of natural forest recovery.
This precision offers policymakers a detailed tool for decisions at local and national levels.
Lower Costs And More Resilient Forests
One of the central points of the study is the comparison between active reforestation and natural regeneration. While regeneration can cost about US$ 5 per acre, tree planting can exceed US$ 10,000 per acre in the same area.
Furthermore, forests that are naturally regenerated tend to harbor greater biodiversity and to remain stable for longer periods.
This does not mean the absence of human action. Assisted natural regeneration can include simple measures, such as the removal of invasive species, fencing to prevent access by herbivorous animals, or the prevention of fires.
These targeted interventions help accelerate a process that is already occurring spontaneously.
The study also shows that the greatest regeneration potential is located 300 meters from existing forests, where seeds and pollinators are more available.
Soil also plays a crucial role, especially when it has high levels of organic carbon, a decisive factor for the success of vegetation.
Local Governance And Future Challenges
Despite the enormous potential identified, researchers warn of the risks. Many areas with high regeneration capacity continue to be threatened by agricultural expansion, urban development, and wildfires.
Without adequate protection, young forests can disappear rapidly.
The authors advocate for strengthening local governance and supporting communities through financial incentives, such as payments for ecosystem services or verified carbon credits.
However, they note that current carbon markets rarely consider forests that regenerate naturally, which limits support for this model.
Fagan emphasizes that implementation must respect local realities. For him, the people living in these areas need to have a voice in where and how to restore, as conditions vary widely from place to place.
In the end, the study suggests that allowing nature to take its course could mitigate nearly 27% of global carbon emissions in deforested areas.
More than a technical solution, it is about recognizing that, often, the most effective answer is already present, awaiting the chance to grow again.
With information from Eart.
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