Two-thirds of our planet is covered in water, split into five distinct oceans, but in reality Earth's seas are part of one huge global water system - a system that has been instrumental in shaping our destiny for millions of years. Now, however, in the 21st century, it is mankind that is shaping the destiny of our oceans. In unprecedented ways, humans are changing our seas and the life within. The ocean bed, the currents, marine life, even the water itself is transformed by what we are putting into our oceans. In this revelatory BBC Four documentary special, oceanographer Dr Helen Czerski and zoologist Dr George McGavin carry out an ‘autopsy’ on the ocean itself and reveal the startling changes it's undergoing. Moving the story beyond the well-known impact of discarded plastic on our seas, the autopsy will investigate the effects of high levels of life-threatening toxins on marine ecosystems and the invisible plague of micro- and nano-plastics saturating the water. The destiny of our oceans is on a knife edge and the window of opportunity to save them is rapidly closing. But all is not lost. Along the way, George and Helen follow some surprising stories of hope as scientists uncover biodiverse ecosystems at the bottom of wind turbines that act as artificial reefs. George also visits the team at the Wallasea Island Wild Coast Project, a coastal wetland restoration initiative on the Essex coast twice the size of the City of London, that has been transformed into a nature reserve for rare and threatened birds and other wildlife using excavated soil from Crossrail.
