Oceans cover two-thirds of the surface area of our blue planet. So it is not really surprising that people are looking to the seas to solve the problems caused by a growing world population.
The first video illustrates what an offshore farm would look like and how they can be used to improve urban food supply.
The second video illustrates a seaweed farm. Seaweed could be used as a feed stock for biofuels or as agricultural fertilizers.