A recent study from UC Riverside highlights the significant climate benefits of planting trees in tropical regions compared to higher latitudes. Tropical forests excel in carbon absorption, cooling the air through moisture release, and fire resistance. The findings indicate that while tree planting is beneficial globally, planting in the tropics yields the most substantial cooling effects due to constant water availability, which enhances a process known as “wood sweating” or evapotranspiration.
In humid climates, trees also increase cloud cover and humidity, further obstructing sunlight and contributing to cooling. The study suggests a global average cooling effect of approximately 0.01°F, with tropical regions experiencing up to 0.8°F cooling. The addition of carbon storage will boost these cooling effects as well.
The research emphasizes the importance of realistic scenarios for tree planting that consider existing ecosystems and deforestation. In some northern areas, however, tree planting may inadvertently lead to increased fire hazards. The authors advocate for finding the “Goldilocks zone” for tree planting, ensuring optimal conditions for maximal climate benefits without compromising existing ecosystems.
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