2024年4月16日发(作者：)
北极熊濒危原因英语作文
英文回答：
Polar bears (Ursus maritimus) are majestic creatures
that have adapted to the harsh conditions of the Arctic.
However, their survival is threatened by a combination of
factors, primarily related to climate change and human
activities.
Climate Change:
Rising global temperatures are leading to the melting
of Arctic sea ice, which is essential for polar bears. Sea
ice provides a stable platform for hunting seals, their
primary food source. As the sea ice melts, polar bears are
forced to travel longer distances to find food, resulting
in increased energy expenditure and reduced hunting success.
The loss of sea ice also affects the availability of
maternal dens, which are crucial for the survival of cubs.
Without adequate dens, cubs are exposed to extreme cold and
predation.
Human Activities:
Pollution: Industrial pollutants, such as PCBs and
heavy metals, accumulate in the Arctic ecosystem and can
adversely affect polar bears. These pollutants can impair
their immune function, reproductive health, and cognitive
abilities.
Overhunting: In the past, polar bears were heavily
hunted for their fur and meat. While hunting is now
regulated, illegal poaching still occurs.
Disturbance: Human activities, such as oil exploration,
tourism, and shipping, can disturb polar bears.
Disturbances can disrupt feeding, breeding, and migration
patterns.
Consequences of Polar Bear Decline:
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