地理漫步·世界地理英语30篇（6）

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地理反馈回路：土地利用如何局部改变气候

Forests absorb moisture and release it slowly, cooling nearby air through evapotranspiration.
When forests are replaced by paved surfaces, heat builds up and alters local wind patterns.
Urban heat islands form where concrete and asphalt store solar energy overnight.
This warming shifts rainfall timing and reduces dew formation in surrounding rural zones.
Wetlands drained for agriculture lower regional humidity and delay monsoon onset.
Desert expansion often follows soil degradation, which further reduces precipitation retention capacity.
Glacier retreat exposes darker rock, accelerating melt through reduced albedo effect.
Coastal mangrove loss weakens storm buffers while increasing saltwater intrusion inland.
Each change triggers secondary effects that reshape microclimates across spatial gradients.
Geographers map these loops to predict tipping points before irreversible thresholds are crossed.