4/4 In the final programme of the series, we find out what the future holds for marine life.
3/4 How ocean traffic, over-fishing and noise pollution could have an impact on marine life.
2/4 The team continue to investigate the effect human impact has had on our marine ecosystem.
This lesson for 7-11 year olds looks at the importance of the Earth's rich marine life.
1/4 In an exciting week of programmes, Blue Planet Live explores the health of our oceans.