Population density is the total population that has been divided by the total area of the land. "Demography" is the "statisticalstudy" of populations. It includes the study of size, structure, and distribution of the population. There are both direct and indirect methods for the data collection. Direct data is vital that tracks all the births and deaths and also include the changes in the legal status such as marriage, divorce, and migration. On the other hand the "indirectmethod" is vastly dependent on the historical demography.
Global climate change is when a change in weather appears in an area where it normally wouldn't. This is normally a change in the temperature, precipitation and/or wind. An example would be the ice caps melting in Antarctica because heat is making its way in where it should not be.
