Final answer:
The article shows a geographical theme by exploring the relationship between geography and climate events, such as glacial growth and changes in ocean patterns, and also highlighting the impact on human history and activities.
Step-by-step explanation:
The article discussing how discharge in the North Pacific set off a series of climate events during the last ice age demonstrates a geographical theme by examining the impact of geographic and environmental factors on global climate patterns. It touches upon the dynamic relationship amongst various spheres such as lithosphere, atmosphere, cryosphere, hydrosphere, biosphere, and anthrosphere.
The topics discussed include changes in ocean circulation, shifts in the earth's orbit, glacial growth, famine, drought, and the melting of polar ice caps all exhibit the interconnectedness of geography with climate.
For instance, it explains how Milankovich's theory indicates that colder winters with more snowfall reflecting sunlight led to the growth of giant glaciers, which is a classic example of how geographical factors such as earth's orbit and land surface albedo can trigger significant climatic shifts.
Moreover, glacial growth during ice ages had profound effects on sea level and ecosystems worldwide, influencing human history through mechanisms such as migration patterns or agricultural productivity. Modern implications of changes in climate due to actions within the anthrosphere, like greenhouse warming, also underscore how human activities have become key geographical factors with wide-ranging environmental impacts.