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Global Climate Change and Its Impacts

ly confined to tropical and subtropical regions to gradually spread into temperate zones. For
example, the Aedes aegypti mosquito, the primary vector for Dengue,Zika virusand Yellow
Fever, has extended its distribution range from equatorial regions to southern North Amer-
ica and parts of Europe in recent years. This expansion not only increases the likelihood of
disease outbreaks in new areas but also places unprecedented pressure on local public health
systems.
Warm and humid climatic conditions favor the reproduction of vector organisms, short-
ening their life cycles and increasing population sizes. In some regions of Africa, rising tem-
peratures have accelerated the breeding rate of Anopheles mosquitoes (Anopheles), thereby
increasing the risk of malaria transmission. Additionally, higher temperatures may enable
vector organisms to remain active year-round rather than being restricted to specific seasons,
further exacerbating the risk of disease transmission.
Rising temperatures have extended the active season of vector organisms, increasing the
time window for disease transmission. Some Nordic countries have observed that,ticksThe
active period of these pests has advanced by several weeks compared to the past, leading to
more opportunities for Lyme disease and othertick-borne diseases to spread. Similarly, mild-
er winters may mean that vector organisms no longer enter dormancy, thereby remaining
active year-round and increasing the chances of disease transmission.

II. Potential Threats of Emerging Infectious Diseases

Human activities such as deforestation and wetland degradation have disrupted natural
ecosystems, forcing wildlife migration and increasing the transmission risks of zoonotic dis-
eases. The 2014 Ebola outbreak in West Africa was closely associated with reduced forest
coverage and altered bat habitats in the region. As wildlife habitats diminish, these animals
are driven closer to human settlements, amplifying opportunities for viral spillover from ani-
mals to humans.
Climate change may trigger pathogen mutations and enhance their adaptability to new
environments. Research shows certain bacteria are more prone to developing drug-resistant
genes under elevated temperatures, thereby diminishing antibiotic effectiveness. Additional-
ly, viruses may mutate due to climate shifts, leading to novel strains that complicate vaccine
development and disease control efforts.
Under the backdrop of globalization, frequent population mobility means localized out-
breaks caused by climate change could rapidly escalate into global public health events. The
2020 COVID-19 pandemic demonstrated the speed and scale of cross-border transmission,
while climate change may further complicate future epidemic prevention and control efforts.
(3) Preparedness of Healthcare Systems
Strengthen disease surveillance networks by employing remote sensing technology,
Geographic Information Systems (GIS), and big data analysis to track vector dynamics and
disease transmission trends in real time. The World Health Organization (WHO) has estab-

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