The first Earth Day was organized in 1970 to promote ecological ideas, encourage respect for life on earth, and highlight growing concern over pollution of the soil, air, and water. Earth Day is now observed in more than 140 nations with outdoor performances, exhibits, street fairs, and television programs that focus on environmental issues. In 1990, Earth Day was marked by an “International Peace Climb,” in which climbers from the US, Soviet Union, and China scaled what peak together? Discuss