The forces you mentioned can be distinguished as follows:
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Migration: This refers to the movement of people from one place to another with the intention of settling in a new location. It can be driven by various factors such as economic opportunities, social connections, environmental conditions, or political situations.
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Globalization: This is the process of increasing interconnectedness and interdependence among countries and cultures, often driven by trade, communication, technology, and the movement of people, ideas, and goods across borders.
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Runoff: This refers to the flow of water, often after precipitation, that moves across the land's surface and can carry pollutants into water bodies.
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Nutrient pollution: This occurs when excess nutrients, typically from agricultural runoff or sewage, enter water bodies, leading to algal blooms and negative impacts on aquatic ecosystems.
Given the context of connecting two different regions where people are changing residence locations, migration would be the most relevant force, as it directly involves the movement of people between locations. Globalization may play a role in the wider context, but migration specifically addresses the change of residence.