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Chapter Three Impacts of Global Climate Change

for agricultural production, biodiversity conservation, andcarbon storage. However, climate
change and its resulting secondary effects are progressively undermining this critical func-
tion.
【1】Increased Soil Erosion
The increase in extreme rainfall events, particularly in areas lacking vegetation protec-
tion, easily leads to severe soil erosion. It is estimated that approximately 24 billion tons of
topsoil are eroded globally each year, posing a significant threat to land productivity. This
issue becomes particularly prominent in mountainous and hilly regions where steep terrain
exacerbates soil erosion problems.
2.Desertification Expansion
Arid and semi-arid regions face desertification risks due to reduced precipitation and
intensified evaporation. Decreased vegetation coverage not only diminishes soil retention
capacity but also creates a vicious cycle: soil impoverishment further inhibits vegetation
growth, which in turn aggravates soil erosion.
3.Accelerated Organic Matter Decomposition
Warm and humid climatic conditions promote microbial activity, accelerating the de-
composition process of organic matter in soil. While this may temporarily enhance soil fer-
tility in the short term, over the long term, it could damage soil structure, reduce water and
nutrient retention capacity, and hinder sustainable agricultural development.

Section 2 Impacts of Global Climate Change on Socioeco-
nomic Systems

Global climate change has significantly affected socioeconomic domains, including
uncertainties in agricultural production, challenges in water resource management, and adap-
tation issues in urbanization processes.

I. Uncertainty in Agricultural Production

Extreme weather events and temperature fluctuations caused by climate change have
created substantial uncertainties in agricultural production, impacting crop yields and food
security. As the foundational industry for human survival, the stability andsustainability of
agriculture directly affect the livelihoods and health of billions worldwide.
(1) Increased Frequency of Extreme Weather Events
In recent years, there has been a significant increase in the frequency of extreme weath-
er events globally, including torrential rains, droughts, floods, and hurricanes. These extreme
weather phenomena not only damage agricultural infrastructure but also lead to crop dam-
age, yield reduction, or even total crop failure. For example:
1.Drought
Regions like the Horn of Africa, the Middle East, and the southwestern United States

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