Australia's biodiversity crisis is unfolding faster than previously understood. The Environment 2025 Report, released this month, reveals that threatened species have surged to 2,175, a startling 54 per cent increase since 2000. Yet the real alarm sits in the finer details: reptile populations have collapsed by 88 per cent over the same period, while frogs have fallen 67 per cent. These are not abstract statistics. They represent the steepest long-term declines of any group measured by Australian scientists.
The Threatened Species Index shows that, on average, species listed as threatened have declined 59 per cent since 2000. That decline has been accelerating. In 2025 alone, 39 new species were added to the threatened list, and climate change has been identified as a threat to nine in ten of them. The numbers reflect a nation grappling with cascading ecological collapse.
For frogs, the story is especially grim. The invasive chytrid fungus, which spread across Australia in the 1980s, has decimated populations globally and caused seven frog extinctions within Australia. For reptiles, cane toads have wreaked havoc on native species, while disease-causing pathogens and habitat loss from land clearing continue to erode populations. The Threatened Reptile Index, published for the first time in 2025, shows monitored reptile and frog species have declined 94 to 97 per cent since 1985.
The crisis extends to Australia's marine ecosystems. The Great Barrier Reef experienced its sixth mass bleaching event in early 2025, following bleaching in 2024. Sea surface temperatures around Australia reached their highest-ever level in 2025. Of particular concern: this was the first time both of Australia's World Heritage-listed reefs, the Great Barrier Reef and Ningaloo, bleached simultaneously. Coral cover on the barrier reef has fallen sharply in all three regions, with the northern section losing a quarter of its coral cover in a single year.
The drivers are well understood. Habitat loss from land clearing and agricultural expansion continues to fragment landscapes. Invasive species outcompete and prey on native wildlife. Altered fire regimes, especially since the interruption of Indigenous land management practices, have reshaped ecosystems. But the 2025 report makes clear that climate change is the accelerant in nearly every equation, turning manageable pressures into catastrophic collapse.
Not all signals are bleak. Australia experienced above-average rainfall in 2025, particularly in Queensland, where the Channel Country rivers flooded spectacularly, sending water toward Kati Thanda-Lake Eyre. Good rainfall kept vegetation green across much of the continent. This offers a stark lesson: nature can recover when conditions allow. The question now is whether Australia will act with the urgency the numbers demand. Read the full threatened species registry or explore coral bleaching data from AIMS.