Ecology of temperature: how street microclimates affect people and nature in cities
Ecology of temperature: how street microclimates affect people and nature in cities
In cities, temperature is not distributed evenly. A difference of just a few degrees between neighboring streets can determine quality of life, residents’ health, and the survival of local organisms. This phenomenon is not accidental – it results from the microclimate, meaning local thermal conditions shaped by buildings, materials, greenery, and the way space is used. Today, the ecology of temperature has become one of the key areas of thinking about urban adaptation to climate change.
What is a street microclimate and how does it form
A street microclimate is a set of local environmental conditions, including air temperature, humidity, sunlight exposure, and air flow. In cities, it is shaped primarily by artificial surfaces such as asphalt, concrete, glass, and metal. These materials heat up faster than soil or vegetation and release heat even long after sunset.
Urban layout is equally important. Narrow streets surrounded by tall buildings limit air circulation and promote heat accumulation. The lack of greenery intensifies this effect, leading to the formation of local heat islands that may differ in temperature by several degrees from nearby, greener areas.
Urban heat islands as an ecological problem
The phenomenon of the urban heat island is most often analyzed in the context of human comfort, but it also has significant ecological consequences. Elevated temperatures affect the rate of water evaporation from soil, increase plant water stress, and alter the living conditions of small organisms.
High temperatures promote the development of pathogens and pests that cope better in warmer environments. At the same time, many native species adapted to cooler and more humid conditions gradually disappear from the most overheated parts of the city.
Impact of microclimate on residents’ health
The ecology of temperature is directly linked to public health. Streets devoid of shade and greenery become high-risk spaces during heat waves, especially for older adults, children, and people with cardiovascular diseases. High nighttime temperatures hinder bodily regeneration, leading to chronic fatigue and reduced immunity.
Studies show that microclimatic differences within a single city can affect hospitalization rates and mortality during periods of extreme heat. This means that the way streets and public spaces are designed has a real impact on the life and health of residents.
The role of greenery in temperature regulation
Vegetation is one of the most effective tools for regulating microclimate. Trees lower temperatures through shade and water evaporation, while green surfaces absorb significantly less heat than asphalt or concrete. Even single street trees can reduce perceived temperature by several degrees.
In practice, organizations that combine ecological knowledge with real action in urban space are playing an increasingly important role. Examples include initiatives implemented by the One More Tree Foundation, showing how conscious tree planting and urban greening can realistically reduce temperatures and improve street microclimates.
What matters is not only the presence of greenery, but also its distribution. Continuous rows of trees, green squares, and uninterrupted biologically active surfaces support air circulation and limit local overheating of space.
Urban materials and the thermal balance
Materials used in cities have a huge impact on the thermal balance of streets. Dark surfaces absorb more solar radiation, while light and porous surfaces reflect part of the energy or allow water infiltration. Cooling pavements and materials with high albedo are increasingly being tested to limit surface heating.
Changing materials alone will not solve the problem, but combined with greenery and water it can significantly improve thermal conditions in the city.
Microclimate and urban biodiversity
Temperature influences which species are able to function in a given part of the city. Overheated streets become ecological barriers that restrict animal movement and fragment habitats. Cooler, green corridors serve as refuges, enabling survival under extreme conditions.
Microclimatic diversity supports biological diversity, provided that the city shapes it consciously rather than striving for a uniform, heavily sealed space.
How to plan heat-resilient streets
Climate-resilient planning assumes designing streets as elements of an ecosystem rather than merely transport corridors. This includes planting trees along pedestrian routes, reducing the width of asphalt surfaces, using green bus stops, and creating shaded areas.
Long-term thinking is also crucial. Trees need time to achieve their full cooling function, which is why decisions made today will matter for decades to come.
Ecology of temperature as an element of a sustainable city
The ecology of temperature combines climatic, health, and environmental issues into one coherent field of action. Cities that can manage street microclimates become more resilient to climate change and more friendly to residents and nature.
Adapting cities to rising temperatures requires cooperation between local governments, businesses, and social organizations. This approach is consistently promoted by the One More Tree Foundation, which implements environmental and educational projects supporting urban resilience to climate change and improving residents’ quality of life.
