What are the main factors of environmental migration?

Environmental migration refers to the population migration caused by the deterioration of the natural environment on which people live; The reasons include natural disasters, ecological environment degradation, environmental pollution and other environmental factors. Environmental migrants caused by catastrophic environmental events such as floods, droughts, mudslides, landslides and earthquakes are called "environmental disaster migrants"; Environmental migration caused by desertification, desertification, soil erosion and other ecological environment degradation can be called "ecological migration"; Environmental migrants caused by environmental pollution incidents can be called "environmental pollution migrants". Environmental migration has three main factors:

(1) The total population exceeds the overloaded area of population environmental capacity, which is the fundamental reason of environmental migration, mainly manifested in the lack of food and water resources, poor sanitation and poor living conditions;

(2) The areas with large population and unsaturated population make environmental migration possible;

(3) The will of immigrants (including the meaning of being forced to realize by compulsory means) enables environmental immigration to be realized.