This Ted Talk is about how coral reefs have been degraded over time, and how these days, people think that a semi-pristine reef is a pristine reef. Sala uses many pictures to get his point across, such as the picture of what was once a thriving reef is now dead corals covered in algae because there is an island of just 5100 people nearby. He also shows us how much life was in these reefs by using a pyramid. We think that herbivores make up most of the reef, but in a healthy reef, is the other way around. Predators make up most of the biomass, and very few herbivores. He also uses a timeline, showing how these reefs were just hundreds of years ago.
I found this TED Talk to be very informative and interesting to watch, as the pictures really bring this Talk to life. This is good for anyone who want to see how things were, or even just watch an amazing video.