Chemicals, oxygen and life support are controlled by anyone who wants to play at the computer. Both halves of very dirty, smoky and polluted. Some of them are trying to break into the other side. Young students, grades 5-7, will be shocked to realize this is the earth. They will be amazed when you tell them they just predicted the earth has days or hours to exist.
Students discuss scenario.
Students list 5 world problems. Students list 5 local problems. The teacher has introduced a model that can be referred to in many ways depending on existing curricula.