The release, organized by the Ukrainian Center for Chiropteran Rehabilitation, drew more than 1,000 attendees on Saturday evening, including families, off-duty soldiers and wildlife enthusiasts.

The event coincided with the onset of spring following a winter marked by subzero temperatures, repeated Russian drone and missile attacks, and widespread power disruptions.Volunteers opened cloth bags at dusk, allowing the bats to take flight as onlookers observed and applauded.

Many of the animals had been rescued from eastern regions affected by fighting, where destruction of buildings has disrupted natural habitats.Anastasiia Vovk, a volunteer with the rehabilitation center, said all 28 bat species in Ukraine are listed as protected due to declining populations.

She said conservation efforts were critical, noting that the animals are included on endangered species lists.Experts say the war has compounded threats to bat populations. Explosions and structural damage have destroyed traditional roosting sites, while disturbances during winter hibernation can be fatal.

Bats reproduce slowly, typically bearing one or two offspring annually, limiting population recovery.Alona Shulenko, who led the release, said habitat loss has forced bats into urban areas, where they shelter in buildings and balconies.

Repairs or demolition of such structures can destroy entire colonies, she added.Ukraine lies along an important eastern European migratory route for bats, all of which in the country are insect-eating and legally protected.

The rehabilitation center said it has rescued more than 30,000 bats overall, including around 4,000 during the past winter.Attendees described the event as a rare opportunity for normalcy amid the conflict.

Oleksii Beliaiev, a Kyiv resident attending with his family, said the gathering provided a temporary distraction from wartime pressures, though he noted the conflict remains the central concern for most Ukrainians.

Shulenko said the organization would continue its work despite the challenges posed by the war, emphasizing that halting rescue efforts could result in significant losses to already vulnerable bat populations.

Global demand for sand, a key component in concrete, glass, and infrastructure development, has increased sharply in recent decades, driven by rapid urbanisation and large-scale construction projects.

According to the United Nations Environment Programme, sand and gravel are the most extracted solid materials worldwide, exceeding fossil fuels and biomass in volume.

The material is essential for producing concrete, which underpins infrastructure such as roads, bridges, housing, and commercial developments. Rapid urban expansion in emerging economies has intensified demand, particularly in regions undergoing large-scale infrastructure investment.

However, not all sand is suitable for construction. Desert sand, shaped by wind erosion, is generally too smooth for use in concrete, leading to increased extraction from riverbeds, coastlines, and marine environments.

The extraction of sand from rivers and coastal areas has raised concerns about environmental degradation. UNEP reports indicate that excessive sand mining can lead to erosion, reduced water quality, loss of biodiversity, and increased vulnerability to flooding.

River ecosystems are particularly affected, as sediment removal alters natural flow patterns and habitats.In several countries, unregulated or illegal sand mining has emerged as a governance challenge. The high demand and relatively low cost of extraction have contributed to informal markets, complicating enforcement of environmental regulations.

Governments and international organisations have begun to address the issue through policy measures aimed at sustainable resource management. UNEP has called for improved monitoring, better data collection, and the development of alternatives to natural sand, including recycled construction materials.

The growing demand for sand has implications for global supply chains and construction costs. As easily accessible sources become depleted, transportation costs increase, affecting project economics.

In some regions, sand has become a strategic resource, influencing local markets and development planning.Efforts to promote sustainable construction practices, including material efficiency and recycling, are gaining attention among policymakers and industry stakeholders.

However, large-scale adoption remains limited, and natural sand continues to dominate supply.The issue highlights the broader challenge of balancing economic growth with resource sustainability.

As urbanisation continues, the pressure on sand resources is expected to persist, requiring coordinated policy responses at national and international levels.