Our oceans are in crisis! Overfishing, climate change and pollution are all contributing to the destruction of ecosystems and marine biologists are seeing the extinction of marine species. Looking more closely, we can see the devastating effect of industrial fishing practices which began back in the 1950s. With the development of technology, global fish populations have been plundered. 90% of the oceans’ large predatory fish, such as tuna, swordfish, marlin and sharks, have been taken from our oceans. Climate change has also had a severe effect. Polar regions are melting and air pollution has increased the acidity of our oceans. Marine biologists have recorded increases in seawater temperatures and sea levels are rising. Both these factors are causing changes in ocean currents which are putting marine animals and fish in danger.