On Tuesday (2 June, 2009) three representatives, Joe, Clement, and Lauren, from S.I.F.E. - Students in Free Enterprise - visited our class and showed us a presentation PowerPoint about sustainability. They talked about social sustainability, economical sustainability, and environmental sustainability.
Using an apple exemplifying the earth, they told us the fraction of land available for growing food/crops; 1/32 of the earth.
They told us about landfills, that there are 1000 closed landfills and 60 open landfills, and how long it takes for rubbish to break down:
Paper - 2.5 months
Milk carton - 5 years
Cigarette - 10 years
Tin can (tin) - 100 years
Beer can (aluminium) - 200-500 years