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"Use the Interactive Footprint Calculator to find your country and see how it compares to others. See what makes up the biggest components of our water footprint. Watch how the index for species populations move and change over time."

Worldchanging.com founder Alex Steffen argues that reducing humanity's ecological footprint is incredibly vital now, as the western consumer lifestyle spreads to developing countries.

"Buy, Use, Toss? A Closer Look at the Things We Buy is an interdisciplinary unit that includes ten fully-planned lessons. This unit is correlated with national science and social studies standards and will lead your students through an exploration of the system of producing and consuming goods that is called the materials economy. Grades: 9-12 Subjects: Science, Social Studies"