But researchers involved in a multi-million pound project say they're already looking at a number of innovative ways to do this, including using robotics to harvest crops and farming insects to feed animals and humans
Professor David Hosken, a researcher at the University of Exeter's Penryn campus, is investigating the use of crickets to feed animals and people.
The ultimate aim of the project is to provide a protein source that has low environmental impact...I think it could be massive, actually. In 50 years time, I'll be surprised if large proportions of our protein intake are not supplied by insects."
Students at the University of Exeter who are required to spend a year abroad as part of their degree say they are in limbo until a decision is made about Brexit.
They are concerned the foreign exchange programme Erasmus may not get funding next year if there is a no-deal Brexit.
Students said they could not book work or accommodation for placements due to start in six months time until they knew what was going on.
The government said the draft EU Withdrawal Agreement means students in UK-based organisations would be able to continue to participate in Erasmus+ exchanges and placements post-exit until the end of the current Erasmus+ programme in December 2020.
A Harry Potter star is joining forces with University of Exeter analysts to survey plastic pollution in UK rivers.
Actor Bonnie Wright, who played Ginny Weasley, is joining Greenpeace volunteers and scientists to collect water samples from three points along the River Wye in Wales.
The samples will be analysed by the University of Exeter and compared with
other samples collected from major rivers across the UK for a report on levels of small pieces of plastic pollution known as "microplastics" - tiny plastic particles, which come from degraded plastics and synthetic clothing.
Scientists said they could be toxic to wildlife and make up a vast proportion of the plastics that flow from rivers into the seas.
Bonnie said she was highlighting the work after being "shocked to learn that most of the plastic that I've ever used is still somewhere here on earth".
Kirsten Thompson, from the university, said there were lots of studies on how much plastic there was in the seas but few so far had investigated the amount and types of plastic carried in rivers.
She said it was hoped the research would help uncover where the plastic was coming from and what impact it was having on creatures such as otters, kingfishers and water voles.