What was the Malthusian hypothesis and is it relevant for studying modern environmental issues? How can the Malthusian trap be avoided? What three factors does ecological economics emphasize in studying economic growth? What is the "Limits to Growth" model? What did it predict? How has the global growth rates of population, agricultural production, and energy use changed over the past 40 years? Will we be able to provide enough food to meet the demands of a growing global population? What will be some of the demands of a growing population on the natural environment? What is the particular problem with cumulative pollutants? What are some of the characteristics of sustainable development? What is the difference between supply augmentation and demand-side management? How might economic history be classified into three distinct periods?