The three human activities that encourage natural hazards are: The greenhouse effect, hazards linked to urban development and deforestation. The greenhouse effect includes carbon dioxide, methane and chlorofluorocarbons which are all causes to pollution. Hazards linked to urban development includes environmental modifications and urbanization along coastal areas are increasing the risk of flooding. During periods of heavy precipitation, these highways act like canals and cause the water to run faster, overflowing and flooding surrounding areas. Deforestation modifies the water cycle by changing the soil's capacity for absorbing and storing water water. Deforestation increases the risk of landslides.
