World Economic Forum News
March 9, 2020
The frequency of disease outbreaks has been increasing steadily. Between 1980 and 2013 there were 12,012 recorded outbreaks, comprising 44 million individual cases and affecting every country in the world. A number of trends have contributed to this rise, including high levels of global travel, trade and connectivity, and high-density living - but the links to climate change and biodiversity are the most striking.
Deforestation has increased steadily over the past two decades and is linked to 31% of outbreaks such as Ebola, and the Zika and Nipah viruses. Deforestation drives wild animals out of their natural habitats and closer to human populations, creating a greater opportunity for zoonotic diseases - that is, diseases that spread from animals to humans. More broadly, climate change has altered and accelerated the transmission patterns of infectious diseases such as Zika, malaria and dengue fever, and has caused human displacement. Movements of large groups to new locations, often under poor conditions, increases displaced populations’ vulnerability to biological threats such as measles, malaria, diarrheal diseases and acute respiratory infections.