Feeding the world's ever-increasing population is a growing challenge, pushing the limits of what the planet can sustain. By 2050, the demand for food will be 70 to 100 percent higher. 

New sustainable ways are needed to supply the world's population. RAZOR's Jo Colan is in Devon to meet a family of mussel farmers who believe they have part of the answer. 

Mussels are now considered one of the ultimate superfoods, being high in protein, low in calories and rich in vitamins and minerals. They also capture and trap carbon as their shells grow through a process known as biomineralization. Not only is this great for marine ecosystems, but when compared to other sources of protein, their carbon footprint is impressively small.

Also in this episode, Emma Keeling visits London based company Cognetivity Neurosciences, who have developed a five minute iPad-based test that uses AI to spot the early signs of dementia. With 46 million people suffering from Alzheimer's and Dementia around the world the app could save healthcare systems billions of dollars by making detection quicker and more efficient. The app is currently being trialled by the UK's health service, the NHS.