There's a Thief in My Kitchen (energy efficiency of different lightbulbs)
http://www.ctenergyeducation.com//lesson.htm?id=7hbhnrx3

Connecticut Energy Education

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In this activity, students calculate the cost of the energy used to operate a common three-bulb light fixture, and compare the costs and amount of CO2 produced for similar incandescent and compact fluorescent light bulbs.

Subject: Environmental Science:Global Change and Climate:Climate Change:Mitigation of climate change, Environmental Science:Energy:Fossil Fuels, Environmental Science:Energy, Geoscience:Atmospheric Science:Climate Change
Resource Type: Activities
Grade Level: Middle (6-8)
Theme: Teach the Earth:Course Topics:Environmental Science, Teach the Earth:Incorporating Societal Issues:Climate Change, Teach the Earth:Course Topics:Atmospheric Science