Have students write a conclusion that summarizes the results of the experiment. Use the knowledge about solar energy that you have acquired to build a simple solar collection device that will heat a volume of water when exposed to the sun. Make a list of the human activities that contribute to the process of global warming. Discuss the Greenhouse Effect and describe the effect that the activities that you listed previously have on the environment. Organize the class in teams.
Teams take sides on the issues involved and use the data to defend their positions.
Make a rule that arguments must be made or defended based on the data collected and research that is available. Of course research data is subject to scrutiny, but only as far as scientific arguments can be made to challenge it. Remind students that personal attacks are not appropriate, and cause the attackers to lose face in the eyes of those who are making sound, well thought out arguments. Each class should be divided into groups representing different countries. You may wish to publish a report on the results of your world conference.