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特別主題：Carbon Footprint
simpleshow explains the Carbon Footprint
https://www.youtube.com/watch?v=8q7_aV8eLUE
What Are Carbon Footprints
https://www.youtube.com/watch?v=Dwkh46MZuIc
Ecological Footprint
http://wwf.panda.org/knowledge_hub/teacher_resources/webfieldtrips/ecological_balance/eco_footprint/
Global Footprint Network
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