It's common knowledge by now that airplanes are bad for the environment. They pump greenhouse gas emissions into the atmosphere at a rather alarming rate. Unfortunately for the planet, flying is an extremely popular and convenient method of transport, and it's highly unlikely that we'll stop using it any time soon.
The race is therefore on to develop a way to power planes that would reduce aviation emissions to net zero. Check out this gallery to find out about the potential for kelp to be used as a biofuel.