What are the two key concepts for this section? Identify six basic causes of the environmental problems that we face. What is exponential growth? What is the rule of 70? What is the current size of...

What are the two key concepts for this section? Identify six basic causes of the environmental problems that we face. What is exponential growth? What is the rule of 70? What is the current size of the human population? About how many people are added each year? How big is the world’s population projected to be in 2050? How do Americans, Indians, and the average people in the poorest countries compare in terms of average resource consumption per person? Summarize the potentially harmful and beneficial environmental effects of affluence.