Trophic downgrading of planet Earth

This influential synthesis argued that the loss of large apex consumers, including big cats and other top predators, is among humanity's most pervasive impacts on nature. Drawing on examples across ecosystems, the authors showed that removing apex predators triggers cascading changes in prey populations, vegetation, fire regimes, disease, nutrient cycling, and biodiversity, often in ways that are surprising and hard to reverse. They contended that the influence of these animals is so far-reaching that their decline reshapes the structure and function of ecosystems worldwide. The paper made the case that conserving large predators such as lions, tigers, and pumas is essential not only for the species themselves but for the integrity of the systems they help regulate. It became a touchstone for understanding why apex predators matter ecologically and a rallying point for predator conservation.