This lecture recounts personal experiences and discusses environmental issues that invoked a desire to teach about the things threatening the earth. Human population growth is cited as the first and foremost environmental challenge in the 20th century. A J-shaped curve is used to illustrate an increase in human population. The relationship between…

This manual is the fourth volume in a series of publications that provide information for the planning of environmentally sound small-scale projects. Programs that aim to protect the renewable natural resources that supply most of the energy used in developing nations are suggested. Considerations are made for physical environmental factors as…