Have the students make a poster to raise awareness about the issue of sewage. Split them into groups of 2 or 3 and have them pick three pieces of information that really stood out for them and that they felt other people should be aware of.
1 tonne = 1000 kg 2.7 million tonnes x 1000 kg/1 tonne = 2 700 000 000 kg plastic for water bottles and, therefore, 2 700 000 000 kg PETs 2 700 000 000 kg PET x 17.5 kg water/1 kg PET = 47 250 000 000 kg water
