This theme issue explores the changes in Iowa's environment. When Native Americans lived in Iowa hundreds of years ago, the land was rich in tall grasslands, fertile soil, wildlife, wetlands, and unpolluted waters. When European-American pioneers settled Iowa in 1833, they changed the environment in order to survive. The first article in this…

Background information, lists of materials needed, and procedures are provided for 12 experiments which focus on various aspects of pollution and the environment. Topics considered in the investigations are: (1) solids in the air; (2) effect of air pollution on nylon; (3) measuring lung capacity; (4) an electrical smoke trap; (5) photosynthesis;…

Appropriate for secondary school social studies, this booklet considers the dilemmas and choices confronting Americans concerned with their environment. The document contains five sections. The first section, "The Gross National By-Product," discusses the progress that has been made in reducing air and water pollution while the nation has only…