Many people are concerned about the possibility that the earth is getting warmer and the effects this change might have on the earth's ecosystem. This unit includes classroom activities to help students understand global warming and its possible effects on human beings. Lessons in the unit provide students with opportunities to study global climate changes, discuss and debate the current arguments for and against global warming and the Greenhouse Effect, investigate the possibility of global warming and the Greenhouse Effect, and present their findings in the form of research reports.