Where have all the fish gone?

The death of corals is already affecting the human communities that depend on the ocean for survival.

Click here to subscribe to The Economist on YouTube: http://econ.trib.al/rWl91R7

The world’s OCEANS cover 70% of our planet, are the frontline in the battle against climate change, and yet are relatively unknown. Dive down to their deepest depths to discover how scientists are using the latest technologies to uncover the vital mysteries that they have hidden.

Check out Economist Films: http://films.economist.com/
Check out The Economist’s full video catalogue: http://econ.st/20IehQk
Like The Economist on Facebook: https://www.facebook.com/TheEconomist/
Follow The Economist on Twitter: https://twitter.com/theeconomist
Follow us on Instagram: https://www.instagram.com/theeconomist/
Follow us on LINE: http://econ.st/1WXkOo6
Follow us on Medium: https://medium.com/@the_economist