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Chapter Three Impacts of Global Climate Change

sitive to soil salinity. Seawater backflow has caused a dramatic increase in soil salt content,
rendering many fertile farmlands unsuitable for rice crops. With sharp declines in agricultur-
al yields, local food security faces grave challenges.
The frequent onslaught and intensification of tropical cyclones present another critical
challenge brought by climate change to Bangladesh’s coastal regions. Situated directly along
the primary trajectory of tropical cyclones, this area now faces increased cyclone formation
frequency and heightened intensity under climate change impacts. When powerful tropical
cyclones strike, they bring roaring winds, torrential rains, and storm surges that surge with
overwhelming force. These extreme weather phenomena inflict catastrophic damage on
local infrastructure, endanger residents’ lives and properties, and devastate ecological envi-
ronments. During one particularly severe tropical cyclone event, ferocious winds instantly
demolished numerous houses, exposing fragile structures’ vulnerability to powerful gusts.
Power and communication infrastructure suffered severe damage, plunging entire regions
into darkness and communication blackouts. Countless residents lost their homes in this di-
saster, with some even perishing in the violent storms and raging storm surges.
In terms of ecosystems, mangrove wetlands - a crucial ecological barrier in coastal ar-
eas - are facing unprecedented crises. Rising sea levels are altering the growth environment
of mangroves, with changes in water depth and salinity affecting their growth and repro-
duction. Meanwhile, frequent tropical cyclone strikes are causing direct physical damage to
mangrove forests. Under the combined effects of multiple factors, mangrove wetland areas
continue to shrink. The reduction of mangroves not only weakens their natural capacity to
resist storm surges and coastal erosion, but also destroys habitats for numerous marine or-
ganisms. This further exacerbates the vulnerability of coastal ecosystems, making the entire
region more fragile and defenseless against climate change impacts.
From the perspective of vulnerability characteristics, the coastal areas of Bangladesh
exhibit extremely high population density, with massive populations concentrated in low-ly-
ing coastal plains. This demographic pattern results in enormous numbers of affected people
when facing disasters like sea level rise and tropical cyclones. Once disasters strike, the lives
and property security of numerous residents will be directly threatened. The local econom-
ic structure remains relatively undiversified, primarily relying on agriculture and fisheries.
Agricultural production suffers tremendously from climate change impacts, as crop yield
reductions lead to sharp declines in farmers’ incomes. In fisheries, deteriorating ecological
environments and reduced marine biological resources have caused significant decreases
in fishermen’s catches. The overall economic resilience remains weak, with generally low
income levels among residents and insufficient funds for post-disaster reconstruction and
effective climate adaptation measures. Regarding infrastructure development, the region
lags behind with incomplete critical engineering facilities such as flood control and tidal
surge prevention systems. Existing protective structures like seawalls struggle to withstand
increasingly powerful storm surges and sea level rise, failing to provide effective protection

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