Whatever adults might accomplish on the green behavior change front, any sustained success in combating climate change will require the help of the world's more than 2.2 billion children. In "TerraKids," Janet Twyman describes a possible Web site where kids learn about their family's carbon footprint and what they can do to help reduce it. TerraKids establishes the child as an agent for changing the green behaviors of other family members. A virtual community within TerraKids encourages kids to team up with other "CarbonBusters" to help create and sustain a greener world. (Contains 1 figure and 3 footnotes.)