The disappearing light: Could we be the final generation to see fireflies?

Firefly populations are declining worldwide as habitat destruction, artificial lighting and pesticide use threaten the insects' survival, prompting conservationists to urge greater efforts to protect the species and the ecosystems they inhabit.

About 18 firefly species in the United States alone are currently facing extinction. Scientists say habitat loss remains the most significant threat to fireflies, which depend on a wide range of environments including wetlands, forests and urban green spaces, says National Geographic.

The insects are particularly vulnerable because they spend most of their lives as eggs, larvae and pupae underground or in moist soil before emerging as adults.

"There are approximately 2,000 species of fireflies, and each has its own habitat requirements," conservation experts say, meaning the destruction of natural environments can have direct consequences for their survival.

Light pollution has emerged as another major challenge. Fireflies rely on bioluminescent signals during courtship, with males flashing to attract mates and females responding from the ground. Excessive artificial light from homes, businesses and street lamps can interfere with those signals, making it more difficult for fireflies to find partners and reproduce.

Experts have compared the impact of artificial lighting on firefly courtship to "cutting a phone line" during a romance.

Pesticides also pose risks. Many insecticides used around homes are broad-spectrum chemicals that kill a wide range of insects, including firefly larvae.

Growing interest in firefly tourism has created additional pressures. While public interest can raise awareness about conservation, large numbers of visitors may inadvertently damage habitats by trampling adults and larvae or disrupting breeding activity when they leave designated viewing areas.

Conservation groups recommend several measures to help protect fireflies.

Creating suitable habitat is considered one of the most effective steps. Leaving leaf litter and woody debris around gardens and properties can provide shelter for developing larvae, while planting native vegetation and allowing grass to grow longer can help retain soil moisture.

Reducing outdoor lighting is also encouraged. Experts recommend turning off unnecessary lights, using motion sensors, timers or dimmers, and closing curtains at night to limit the amount of indoor light escaping outdoors. Shielded outdoor fixtures can further reduce light pollution.

Avoiding pesticide use can also benefit local firefly populations by preventing the accidental killing of larvae and other beneficial insects.

For visitors to firefly viewing sites, conservationists advise staying on designated paths and limiting torch use. Those who need a light are encouraged to use a dark red filter, although experts say complete darkness is preferable.

Broader conservation efforts include participation in citizen-science initiatives such as the Firefly Atlas, which collects data on firefly populations in North America. Support for conservation organisations and local habitat-protection projects can also contribute to long-term preservation efforts.

Conservationists say protecting fireflies benefits more than a single group of insects, helping preserve ecosystems that support a wide range of plant and animal life.