Which of the current threats to the "commons" (global warming, acid rain, etc.) do you feel is the most serious? Explain why. To what extent do you think citizens of the developed world are aware of these threats and to what extent are they responsible to alleviate these threats? Are the United States and other developed countries responsible to protect less developed countries and their indigenous peoples (e.g., the responsibility of the Brazilian government to protect the Amazon rain forest and the few remaining uncontacted native peoples who live there)?