What are the main causes of population increase and decrease?

Answer 1

The rapid growth of the world's population over the past one hundred years results from a difference between the rate of birth and the rate of death. The human population will increase by 1 billion people in the next decade. This is like adding the whole population of China to the world's population. The growth in human population around the world affects all people through its impact on the economy and environment. The current rate of population growth is now a significant burden to human well being.

Until recently, birth rates and death rates were about the same, keeping the population stable. People had many children, but a large number of them died before age five.

During the Industrial Revolution, a period of history in Europe and North America where there were great advances in science and technology, the success in reducing death rates was attributable to several factors:

(1) increases in food production and distribution,

(2) improvement in public health (water and sanitation), and

(3) medical technology (vaccines and antibiotics), along with gains in education and standards of living within many developing nations.

Without these attributes present in many children's lives, they could not have survived common diseases like measles or the flu. People were able to fight and cure deadly germs that once killed them. In addition, because of the technology, people could produce more and different kinds of food. Gradually, over a period of time, these discoveries and inventions spread throughout the world, lowering death rates and improving the quality of life for most people.

Answer 2

Population by birth increases when there is lots of food, mid weather no disease and peace. Population falls with drought, famine, disease and war. Population may rise if people fleeing drought, famine, disease or war leave their country and come to yours.

Answer 3

the major causes of population change are births,death, and migration