Urbanization is the population shift from rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change. It can also mean population growth in urban areas instead of rural ones.
In his 2009 book Whole Earth Discipline, Stewart Brand argues that the effects of urbanization are primarily positive for the environment. First, the birth rate of new urban dwellers falls immediately to replacement rate and keeps falling, reducing environmental stresses caused by population growth. Secondly, emigration from rural areas reduces destructive subsistence farming techniques, such as improperly implemented slash-and-burn agriculture.
However, existing infrastructure and city planning practices are not sustainable. In July 2013, a report issued by the United Nations warned that with 2.4 billion more people by 2050, the amount of food produced will have to increase by 70%, straining food resources, especially in countries already facing food insecurity due to changing environmental conditions. The mix of changing environmental conditions and the growing population of urban regions, according to UN experts, will strain basic sanitation systems and health care, and potentially cause a humanitarian and environmental disaster.
Rapid urbanization has led to increased mortality from non-communicable diseases associated with lifestyle, including cancer and heart disease. Residents in poor urban areas such as slums and informal settlements suffer disproportionately from disease, injury, premature death, and the combination of ill-health and poverty entrenches disadvantage over time.
According to the passage, which of the following is a potential outcome of rural-to-urban migration?
A. A significant increase in birth rates as people settle into urban areas
B. An improvement in food security due to less pressure on rural agricultural practices
C. Reduced environmental damage from unsustainable agricultural methods
D. An increase in the use of sustainable city planning and infrastructure
E. Greater access to health care for people in urban slums