Teaching activity
Costing the Earth
![](https://tutor2u-net.imgix.net/user-photos/eventhost-RuthTarrant.png?auto=compress%2Cformat&crop=focalpoint&fit=crop&fp-x=0.5&fp-y=0.5&h=100&q=80&w=100)
Ruth Tarrant
15th October 2015
This super interactive graphic and quiz from the BBC Earth team provides a neat starter to the topic of externalities.
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