1 “.... The number of armed conflicts has never been higher since the end of World War II. At the same time...”

2 “... make the work of preservation a greater challenge than it has been since World War II...”

3 “... environmental values since World War II." "Throughout his career, Commoner believed that scientists had a social...”

4 “... acid rain research and policy initiatives; horrendous post-World War II domestic industrial pollution...”