Climate change and insects. Who loses, who benefits, and what it means for us?
Climate change and insects. Who loses, who benefits, and what it means for us?
Why insects react so quickly to climate change
Insects are among the fastest-responding organisms in entire ecosystems. Their life cycles are short, populations can change within a single season, and even small differences in temperature or humidity immediately affect their behaviour. We observe that even a single warmer month can disrupt hatching rhythms, migration patterns or overwintering stages. This makes insects a clear indicator that the climate is changing faster than nature can adapt.
Species that are losing out
The most affected are specialised species tied to specific habitats. Bumblebees struggle with extreme heat and drought, many wet-meadow butterflies are disappearing as moist habitats shrink, and solitary bees are highly sensitive to spring anomalies — they wake up during the first warm days, but flowering plants are not yet available. Soil-dwelling insects are also under pressure because soils dry out faster and lose suitable conditions. Mild winters additionally cause adult-overwintering insects to wake too early and fail to survive until spring.
Species that benefit. What spreads thanks to warming?
While sensitive species decline, others take advantage of the warming climate. Mosquito populations are increasing and their activity season is longer. Ticks expand into areas where they previously could not survive winter. Expansive and invasive insects also thrive, often displacing native species. Some plant pests develop more quickly in warmer seasons, meaning they need less time to complete their life cycles and can produce more generations per year.
What happens when the system loses balance?
When some insects disappear and others begin to dominate, the whole ecosystem loses stability. There are too few pollinators, plants set fewer fruits, and populations of plant-eating insects grow faster because their natural predators become less common. Without organisms that decompose organic matter, the soil loses quality and resilience. The system becomes more vulnerable to drought, disease and degradation.
How insect behaviour is changing
Climate change affects not only insect numbers but also their behaviour. Many insects start activity earlier than usual, before plants reach full bloom. Reproductive cycles can overlap, disrupting natural seasonality. Some species shift their ranges northward, while pests may produce more generations per season, increasing pressure on plants. Synchronisations that kept plant-insect relationships stable for centuries are breaking down.
Effects visible in everyday life
We already feel the consequences of these changes. The most important include:
weaker pollination, leading to lower yields and poorer fruiting of plants,
greater pressure from pests, increasing the cost of cultivation and food production,
an increase in insect-borne diseases, especially tick-borne and mosquito-borne illnesses,
a decline in biodiversity, making ecosystems less resilient to drought and extreme weather.
This means climate change is not a distant phenomenon – it directly affects our safety, health and quality of life, and its consequences may intensify with each season if we do not strengthen ecological balance.
Actions that support beneficial insects
Although we cannot stop climate change locally, we can reduce its impacts and strengthen insects that are essential for ecosystem functioning. We do this by planting native and long-flowering species, creating flower meadows and small gardens, reducing mowing, providing water for insects and avoiding chemicals in gardens.
As the One More Tree Foundation, we regularly support insects in Poland by organizing flower meadow plantings and workshops on building insect shelters. We work with youth, seniors, organizations and companies, protecting nature and educating society.
Every small step that supports pollinators, decomposers and natural regulators strengthens the environment we live in.
