German sociologist georg simmel argued that shifts in the environment affecting substantial portions of the population consequences on the ways that individuals act and interact.

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Explanation:

Georg Simmel argued that the way people behave with one another is not only influenced by the personality of the people, but also the resources that available around their environment.

For example,

In an environment with abundance of food and water source, it is much easier for people to live peacefully with one another. This happen because they will less likely see other people as a threat to their survival, since they can easily find other foods source in case another group somehow take the one that is near them.

But this will not be the case in an environment with lack of food and water source.

The scarcity of the resources make the people become much more competitive to get the available resources. This will increase the likelihood of conflict with other groups and most likely make them act negatively toward each other.