
An apple is sliced into pieces to model the current amount of agricultural land on Earth. Then...

The percentage of global energy use from renewable sources has increased since 1990.

Overview of population cartogram: what is it, when it's used, and limitations.
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"The activities not only bring out important content, but they also provide real-world context for environmental, population and sustainability issues. They engage participants in very thought-provoking and critical-thinking discussions.”
Helen de la Maza, Environmental Educator, Irvine, CA