# Why is population growth a concern?

The world's population is getting larger, but the world itself remains the same size, therefore it is getting more crowded. There more people there are, the harder it is going to be to supply everybody with housing, food, water, employment, transportation, and all the other necessities of life. There will be shortages, and in many countries there already are.

### Why is the population growth growing?

Population growth is the change in a population over time, and can be quantified as the change in the number of individuals of anyspecies in a population using "per unit time" for measurement. In biology, the term population growth is likely to refer to any knownorganism, but this article deals mostly with the application of the term to human populations in demography. In demography, population growth is used informally for the more specific term population…

### How do the concepts of birthrate and population growth differ?

Birthrate is how many people are born, while the population growth includes the death rate as well. If the birthrate minus the death rate is positive then the population growth is +. If it is negative there is a decrease in population (the population is - ). The population growth also takes emigation and immigration into the picture.