What are some important consequences of cycles of glaciation and deglaciation, both for the landscape and for impacts upon humans?
How might other processes, such as sedimentation, volcanism, or tectonics, also be important in these respects?
What are some important advantages and disadvantages of an agricultural lifestyle relative to a hunter-gatherer lifestyle?
What types of geological and environmental phenomena may have had significant impacts upon humanity in the past?
Which may be likely to have significant impacts in the future?
What are some specific historical examples?
What evidence links human activity to past extinctions?
What were some mechanisms and impacts of increased food production?
What are some interesting aspects of the transition from hunter-gatherer to agricultural society?