Explorers going to the North or South Poles must carry green vegetables and fruit juices with them. Why is this necessary?

Explorers going to the North or South Poles must carry green vegetable

1.	Explorers going to the North or South Poles must carry green vegetables and fruit juices with them. Why is this necessary?
Answer» Explorers going to the North or South Poles must carry green vegetables and fruit juices with them. Why is this necessary?