Forests as Climate Regulators

Forests help mitigate climate change by cooling the local environment, regulating water cycles, and improving human health and well-being

To the Point

• Water cycle: Forests promote evaporation and cloud formation, which influences precipitation and helps stabilize the regional climate, while also reducing the risk of flooding.
• Quality of life: By cooling the surrounding environment and improving air quality, forests directly contribute to people’s quality of life, especially in densely populated areas.
• Policy and forest management: Climate policy should take a holistic view of forests to avoid misguided decisions and systematically integrate both environmental conditions and societal benefits.

Forests play a central role in climate mitigation, but their contribution extends far beyond carbon sequestration. A new review highlights that focusing solely on carbon storage risks underestimating the broader climate services forests provide. By interacting with the atmosphere, land surface, and hydrological systems, forests influence local and regional climates in multiple, interconnected ways. These effects can complement or, in some contexts, even outweigh their role as carbon sinks – particularly over shorter timescales relevant for adaptation planning.

One of the most immediate benefits of forests is their ability to regulate temperature. Through shading and evapotranspiration, forests reduce surface and air temperatures, especially during heat extremes. This cooling effect can be particularly pronounced in temperate and tropical regions, where dense vegetation enhances moisture exchange with the atmosphere. In contrast, in high-latitude regions, darker forest canopies may absorb more solar radiation than snow-covered open land, potentially leading to localized warming. These contrasting effects underscore that the climate benefits of forests are not uniform, but depend strongly on geographic and seasonal context.

Hydrological Impacts

Forests are also key actors in the global water cycle. By facilitating evapotranspiration, they contribute to cloud formation and precipitation patterns, both locally and downwind. This can stabilize regional climates and reduce the risk of drought. At the same time, forests influence soil moisture, groundwater recharge, and runoff dynamics, thereby reducing flood risks in some contexts. However, these hydrological effects are complex and vary with forest type, management practices, and climate zone. The review emphasizes that understanding these dynamics is essential for designing effective land-use and climate policies.

Beyond physical climate processes, forests deliver significant benefits for human health and well-being. By moderating temperatures, they reduce heat stress in urban and rural areas alike. Improved air quality, recreational opportunities, and psychological benefits further enhance their societal value. These co-benefits are particularly relevant in densely populated regions, where even small changes in local climate conditions can have large impacts on public health and quality of life.

Implications for Policy and Forest Management

The findings carry important implications for climate policy and land management. A narrow focus on carbon accounting may lead to suboptimal decisions, such as prioritizing tree planting in regions where it could reduce surface albedo or strain water resources. Instead, policies should adopt a more integrated perspective that accounts for the full range of forest-climate interactions. This includes tailoring forest management strategies to local environmental conditions, balancing carbon storage with temperature and water regulation, and explicitly considering societal co-benefits. Incorporating these multiple dimensions into climate models and decision-making frameworks can improve the effectiveness of both mitigation and adaptation efforts.

Ultimately, the review calls for a shift in how forests are valued in climate strategies. Recognizing their multifunctional role not only strengthens the scientific basis for policy but also highlights their broader contribution to resilient and sustainable societies.