In 2025, fires were responsible for a significant spike in forest loss in three territories in Brazil that are home to Indigenous peoples living in voluntary isolation, according to Global Forest Watch data analyzed by Mongabay. Indigenous leaders from the Alto Turiaçu, Uru-Eu-Wau-Wau, and Apiaká do Pontal e Isolados Indigenous territories, told Mongabay that fire is a growing threat to their way of life and the isolated Indigenous people who share the same lands. It affects their productive practices and destroys the biodiversity and vegetation they depend on for hunting and gathering, thereby leading to food insecurity. Damage to health, such as respiratory problems caused by the smoke, is another impact frequently mentioned by sources Mongabay spoke to. “The communities suffer from health problems caused by the smoke, difficulties in mobility, and food insecurity because several planting areas are affected,” Almir Narayamoga Suruí, a Paiter Suruí Indigenous community member from the Sete de Setembro Indigenous Territory that straddles the Amazonian states of Rondônia and Mato Grosso, told Mongabay via WhatsApp. “Culturally, the impact is also very strong because the forest for us is not just a natural resource; it is part of our spirituality, our history, and our identity. When an area of the forest is destroyed, we also lose part of our memory and the traditional knowledge transmitted by our ancestors.” Mongabay looked at forest loss and its dominant drivers across territories in Brazil with recognized isolated Indigenous peoples, using Global Forest Watch (GFW) drivers data that rely on…This article was originally published on Mongabay

For years, Wayne Mercredi spent hours driving the Tibbitt to Contwoyto winter road. Leaving early in the morning to take advantage of limited daylight, he’d travel the road’s 400-kilometer length (250-mile length) — built atop frozen lakes, to connect the territorial capital of Yellowknife to diamond mines farther north — before turning around at the end and driving back home. On those 19-hour days, Mercredi, a North Slave Métis Alliance guardian, kept his eyes peeled. “I would see caribou off in the distance, avoiding the ice road.” As caribou appeared on the snowy expanse, he’d record their information. Occasionally, he’d come across an increasingly rare sight: A large herd of caribou, navigating the landscape. “It’s such a beautiful thing, it would just fill my heart.” The Canadian Arctic is home to once-monumental herds of caribou. These caribou undertake the longest terrestrial migrations on the planet, congregating in large groups at their calving grounds along the way. Historically, caribou existed in the millions, but in the last several decades, their numbers have declined dramatically; the Bathurst herd, for example (whose name derives from their traditional calving grounds in Bathurst Inlet, Nunavut) numbered nearly half a million caribou in the 1980s but has shrunk to just 3,600 in 2025. The reasons for this decline are multifaceted, including climate change, industrial development and, in some cases, overharvesting. But many of these forces intersect around roads, which block migrations and expose caribou to more hunting. Concern over the impacts of roads have promoted Indigenous…This article was originally published on Mongabay

DERBY, Australia — While Spanish sailors packed in dirt to stabilize the bottom of ships sailing from the Americas in the 16th century, they were unaware that they were also helping tiny stowaways aboard. Research suggests that tropical fire ants sailed across the Pacific Ocean, joining Europeans over the centuries as they landed and colonized landmasses across the world. Then, in the early 2000s, tropical fire ants (Solenopsis geminata) were detected on Melville Island in the Tiwi Islands, a picturesque archipelago off the coast of Darwin, the capital of Australia’s Northern Territory. Here, they were able to flourish, according to researchers, and have since become naturalized in parts of the Australian tropics while dominating the environment, eating small mammals, and potentially deterring nesting birds. “The ants have a huge impact on native birds and animals on the Tiwi Islands,” said Stanley Tipungwuti, a ranger on the islands where most identify as Aboriginal or Torres Strait Islander. But after two decades of effort, and the work of the Tiwi Ranger team, tropical fire ants are deemed no more on Merville Island: In 2025, the species was completely eradicated, according to Ben Hoffmann, who was part of the eradication program from its inception. That same year, the Tiwi Island Rangers received the Territory Indigenous Natural Resource Management Award in Darwin for their efforts. The Tiwi Rangers were the 2025 winners of the Territory NRM Indigenous Natural Resource Management Award. Image by the Territory Natural Resource Management Award, supplied by Tiwi Resources. Hoffmann, principal research…This article was originally published on Mongabay

A crackdown by the Brazilian government on land-grabbers who cleared primary Amazon forest for ranching and other agricultural activities in the Piripkura Indigenous Territory is yielding some results, with satellite analysis by Mongabay indicating a decline in deforestation. But one tricky problem remains, according to government agents and Indigenous rights organizations: removing their cattle. The 242,405-hectare (598,995-acre) Piripkura Indigenous Territory in west-central Brazil’s Mato Grosso state is home to the last two — known — Indigenous Piripkura people in voluntary isolation. According to Jair Candor, the coordinator of the Funai unit that protects isolated Indigenous groups, a third Piripkura person left the land and married into another tribe, the Karipuna, several decades ago. Funai, the country’s Indigenous affairs agency, has not yet ruled out the possibility that more isolated people live there. Ranchers coming in with their cattle to graze land have contributed to a large share of forest loss here. According to data from Global Forest Watch, the area lost a total tree cover of 1,769 hectares (4,371 acres) in 2021 — equivalent to 2,500 soccer fields — representing the largest increase since 2004, when the area lost was almost double (3,276 hectares, or 8,095 acres). Since the spike in 2021, due to successful operations by government agencies, deforestation has declined substantially, and despite a slight increase in 2023, losses remained far below 2021 levels and continued to decrease in 2024 and 2025. By 2025, tree cover loss had fallen to 106 hectares (262 acres). While deforestation has slowed…This article was originally published on Mongabay