With the papercraft globes (or icosahedra) from the Japan Meteorological Agency you can compare the CO2 (carbon dioxide) levels in Earth's atmosphere in 1985, 1999 and 2011.
Download + build your own papercraft CO2 level globes/icosahedra (by Japan Meteorological Agency):
http://ds.data.jma.go.jp/ghg/kanshi/info/download.html
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