When it comes to natural disasters, people will think of meteorological or geological disasters such as floods, droughts, earthquakes, and tsunamis. Some of the harms caused by animal and plant activities, e specially human major epidemics, are rarely compared with natural disasters. In fact, in a broad sense, t he major casualties and damages caused by various biological activities (including animal, plant and microbial activities) to human life and living environment are also natural disasters. Of course, in a narrow sense, they can be called biological disasters. Biological disasters are defined as: a small number of organisms accidentally seize the niche, resulting in the destruction of the symbiotic, competition, synergy and other balances between the original biological populations, beyond the ecosystem's own resilience, thus creating human, property, and environmental damage.
Before the birth of mankind, there were countless kinds of animals, plants and microbes living on earth. They have their own way of life and reproduction. The birth and development of human beings are inseparable rom these creatures. They provide human beings with all kinds of substances necessary for survival, and human beings. Their lives also provide them with a variety of conditions for growth and reproduction. Various organisms constitute an interdependent biosphere in nature. In this biological world, any species that exists on Earth is the basis for maintaining ecological balance. Once a certain biological chain is destroyed, it will have a major impact on the life and living environment of other organisms. This happens to humans and can lead to disaster. The epidemic of countless plagues in the history of human development has led to a sharp decline in population and frustration in social and economic development. This is the result of this disaster.
Many of the world's living things are interconnected, mutually constrained, and interdependent, thus forming an inseparable unity that scientists call an "ecosystem." This relatively stable phase of equilibrium in the ecosystem is called “ecological balance”. Once the balance is lost, it will lead to natural disasters.
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