forest health
Protecting Earth’s Lungs
Forests act as the planet’s terrestrial lungs. They provide us with fresh air, clean water, beautiful vistas and a sanctuary for countless wildlife.
But, today, more than ever, our forests are facing unprecedented threats from disease, climate change, mad-made destruction and harmful pests.
Join this documentary as it follows a group of professionals that developed, tested and formulated today’s forest health strategies to preserve the legacy of one of the planet’s most important resources – and to help us better understand and appreciate why we need to protect our forests.
This is a story that affects us all.
Reforesting the Planet, Restoring the Future
The preservation of the planet’s biodiversity relies entirely on how we manage and interact with the world’s forests.
Reforestation is a critical strategy for mitigating climate change because it increases the Earth’s capacity to absorb carbon dioxide (CO₂) – the main greenhouse gas driving global warming – while also enhancing ecosystem resilience.
In particular, we look at recent studies investigating the most cost-effective approaches to reforestation and the mitigation of climate change. For many years, forest managers have been asking which is best: allowing forests to naturally regenerate, on the one hand, or to plant new forests?
Our Broken Planet: How to heal our rainforests
Breathe in. Breathe out. The oxygen flowing through your body is the result of photosynthesis: the natural process through which living things convert sunlight into energy. About 30% of land-based photosynthesis happens in tropical rainforests. Rainforests are also great at sucking up excess carbon from the atmosphere – something we know we’ve got to do more of.
But in recent years, rainforests have been getting constricted: shrinking in size and choked up with smoke.
Listen to this podcast from the National History Museum to find out what’s going on and how we can help rainforests breathe deeply again.
Dr. Mark Finney: Changing How We Fight (and live with) Fire
Dr. Mark Finney is a Senior Scientist and Research Forester with the U.S. Forest Service at the Missoula Fire Sciences Laboratory. With a Ph.D. in wildland fire science from UC Berkeley, Finney has spent decades exploring fire as both an ecological force and a physical process. His work has laid the foundation for many of the wildfire behavior models used today across the country.
Finney is a strong advocate for rethinking traditional fire suppression strategies. He emphasizes the need to let “good fire” play its role in the landscape, using tools like prescribed burns and targeted fuel treatments to prevent more extreme fires down the line. His research has revealed that long-held beliefs about how fires spread, such as the role of radiant heat, are often incorrect.
The Age of Firestorms
Dr. Roslyn Prinsley never imagined that stepping outside her home in Canberra would feel like walking into a smoke-filled abyss. But during Australia’s devastating bushfire season in 2019-2020, even in places untouched by flames, the air was so thick with smoke that breathing felt impossible.
“I asked myself, what are we doing here in the 21st century? We can’t actually go outside and breathe fresh air in one of the cleanest countries in the world,” she remembers thinking. “We can’t let this keep going.”
Dr. Roslyn Prinsley is the Head of Disaster Solutions at the Australian National University’s Institute for Climate, Energy & Disaster Solutions (ICEDS). Finding innovative ways to fight wildfires is part of her daily work – a task that has become more urgent than ever as wildfires grow increasingly frequent in Australia and across the globe due to climate change.
Wildfires are projected to rise 30% by the end of 2050, according to a report by the UN Environment Programme (UNEP) and its partner GRID-Arendal.
One of the recent wildfires in California became the most destructive in Los Angeles history, killing at least 29 people—a number expected to rise—and reducing over 10,000 homes to ash. A perfect set of environmental factors such as long-term drought, preceding heavy rainfall, and hurricane-force Santa Ana winds combined at the worst possible moment.
All of this turned the regular wildfire into what’s called a firestorm.
Inside the L.A. Firestorm
The 2025 LA Wildfires were among the most destructive and costly in U.S. history, driven by a combination of shifting climate patterns and growing development in fire-prone areas. As these types of fires become more common, it raises important questions about how we prepare for and respond to future risks. In this PBS video, experts explore the factors behind the firestorm and what can be done to reduce the impact of similar events going forward.
Jacques Régnière: Budworm to BioSIM
Jacques Régnière, born in Quebec City, has dedicated over four decades to advancing our understanding of forest pests and protecting our global forests. Earning his bachelor’s degree in biology from Laval University and a Ph.D. in insect ecology and biomathematics from North Carolina State University, Régnière began his career at the Canadian Forest Service in 1980, where he served until his retirement in 2024.
Throughout his distinguished career, Régnière focused on pressing issues in forest ecology, notably the population dynamics of the spruce budworm, mountain pine beetle, and spongy moth. His work in quantitative ecology has influenced pest management practices and provided a better understanding of climate change’s impact on invasive species and forest health.
Purdue launches new AI-based global forest mapping project
Purdue University’s Jingjing Liang has received a two-year, $870,000 grant from the World Resources Institute to map global forest carbon accumulation rates.
“To accurately capture the carbon accumulation rates of forested ecosystems across the world has always been a challenging task, mostly because doing so requires lots of ground-sourced data, and currently such data are very limited to the scientific community,” said Liang, an associate professor of quantitative forest ecology and co-director of the Forest Advanced Computing and Artificial Intelligence Lab.
“This task is considerably more challenging than mapping carbon emissions from forest loss,” said Nancy Harris, research director of the Land & Carbon Lab at the World Resources Institute, a nonprofit research organization based in Washington, D.C. “With emissions, there’s a clear signal in satellite imagery when trees are cut, leading to a big drop in forest carbon stocks and a relatively abrupt pulse of emissions to the atmosphere. With sequestration, forests accumulate carbon gradually and nonlinearly.”
The Role of Technology in Forest Management
In Brazil’s Pará region, new roads are cutting through the pristine Amazon rainforest, opening up once-untouched areas to human activities. Expansive stretches of lush greenery are vanishing at an alarming pace, yielding to barren patches and freshly cleared land.
Meanwhile, far into space, the European Space Agency captures high-resolution satellite images of the region that unveil an important pattern: deforestation occurs predominantly near these newly constructed roads.
Back in 2016, it sparked a question: what if there were a tool to monitor these roads and forecast potential deforestation areas? Not long after PrevisIA was born.
In 2021, Microsoft with Vale Fund and the Amazon Institute for Man and the Environment (Imazon) developed a new AI tool called PrevisIA, to predict deforestation hotspots in the Amazon. Using satellite imagery from the European Space Agency and an algorithm developed by Imazon, the tool produces heat maps showing the most exposed conservation areas, Indigenous lands, and other settlements, along with rankings for states and municipalities.
Single-Photon Lidar
The Canadian Institute of Forestry in partnership with the Canadian Wood Fibre Centre and other organizations are currently researching the potential of single photon lidar for Ontario’s
Enhanced Forest Resource Inventory (EFI) at the Petawawa Research Forest (PRF).
What is Lidar?
A lidar (light detection and ranging) sensors will emit light pulses that will reflect or bounce off objects, such as standing trees or the ground. This measures the time of return and the distance that each pulse travels. The result is highly detailed 3-D point clouds of the forest environment.