In medicine, silence can be more alarming than noise. For example, a patient who abruptly stops voicing discomfort or a monitor that ceases activity may signal system failure rather than resolution. Ecology presents a similar scenario, and currently, the silence is deeply concerning.

Insects are disappearing across vast regions globally. This is not a modest decline or a simple geographic shift, but a rapid vanishing of beetles, butterflies, moths, flies, mosquitoes, bees, and entire functional groups. This phenomenon is not speculative or anecdotal; it is among the most consistently documented biological trends of the past 50 years and remains insufficiently addressed. For context, the total biomass of lost insects is comparable to the combined weight of all commercial aircraft worldwide, representing a profound ecological and economic loss.

For decades, insects were treated as background noise—annoyances at best, pests at worst. Their abundance was assumed, their resilience taken for granted. We designed agricultural systems, urban environments, chemical interventions, and technological solutions on the unspoken assumption that insects would always be there. They were too numerous to fail.

This assumption has proven incorrect.

The Data Are Not Subtle
One of the most widely cited early warnings came from a long-term German entomological study that tracked flying insect biomass across protected areas over nearly three decades. The result shocked even the investigators: a decline of more than 75% in total flying insect biomass between 1989 and 2016.¹ These were not industrial zones or pesticide-saturated fields. They were nature preserves. However, many regions like Africa and large parts of Asia still lack comprehensive, long-term insect monitoring, leaving significant gaps in our understanding of global insect declines.

Subsequent studies confirmed that this was not an anomaly. A global review published in Biological Conservation concluded that approximately 40% of insect species are threatened with extinction, with declines accelerating in recent decades.² Longitudinal data from the United Kingdom, the Netherlands, Puerto Rico, North America, and East Asia tell the same story with local variation but consistent direction.³-⁶

The loss is not limited to rare or specialized species. Common insects—the ones that once filled the air—are disappearing fastest. Entomologists now openly discuss “functional extinction,” a state in which species technically still exist but no longer play their ecological roles in meaningful numbers.⁷

The significance of this issue is often underestimated.

Insects Are Not Optional
Insects occupy a central role in terrestrial and freshwater ecosystems. They pollinate plants, recycle nutrients, regulate microbial populations, control pest species, and serve as the primary food source for numerous birds, amphibians, reptiles, and fish. Rather than being peripheral, insects form the structural foundation of these systems. The loss of these foundational species could result in the disappearance of familiar foods such as coffee, chocolate, apples, and almonds, directly impacting daily nutrition.

Read More: Insect Loss As an Early Warning of Systemic Biological Failure