Research the history of water and air pollution.
Find an image of the Amazon Rainforest from 50 or so years ago and find an image from today showing the effects of deforestation. Compare and contrast these images.
60 years ago nothing could survive in the River Thames – it was declared biologically dead. Today, there is thriving river life – even seals have been spotted in certain areas of the Thames! What caused the river to be declared biologically dead and what changed to see the return of life?