International migration
Ecological problems
Pollution
Air
Water
Aesthetic pollution of nature
Health problem
Allergy
Cardiovascular diseases
Asthma attacks
Armed conflicts
Ethnic disagreements
Religious disagreements
Racism
Terrorism
Extremism
Social conflicts
Global climate
Preference of hot climate
Preference of cold climate
Health problems
High blood pressure
Intracranial pressure
Allergy
Accidental circumstances
Marriage
Divorce
Family conflicts
Best conditions of work and payment
Deterioration of working conditions
подтема
Visa expiration
Lack of citizenship
Deportation