Answer:
The carbon footprint is a very important means to understand the impact of a person's behavior on global warming. This is why someone who effectively wants to contribute to stopping global warming, at least on an individual scale, needs to measure and keep track of their personal carbon footprint.
Explanation:
Earth has seasons because its axis is tilted.
Population density because as more offspring is born the land in which the population is inhabiting is becoming more dense with that particular population.