Dr Mathis Wackernagel's (developer of the ecological footprint) footprint calculator.
"Every semester I have my students calculate their Footprint, change their lifestyle for one week to decrease that Footprint, then compare the results and how it would impact the number of people that could sustainably exist on the planet. Students are shocked when they discover their results. The fact that it is personal and tells them how many planets we would need if everyone on the planet lived as they do drives home the issue better than I ever could in lecture."
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Visualize virtually every U.S. company's international supply chain. E.x. What products, how much, which factories and where does Lululemon import from? (Just type a company in the search box)
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"Welcome to the OpenGlobus overview page! OpenGlobus is a javascript library designed to display interactive 3d maps and planets with map tiles, imagery and vector data, markers and 3d objects. It uses the WebGL technology, open source and completely free."