Interesting video.
I never knew the Vikings sails were made of wool.
New Zealands economy was built upon the sheeps back- it was something we could export back to Britain before refrigeration also enabled export of the meat.
When refrigeration came in the 1880s NZs economy boomed.
Later in the world war and Korea and Vietnam elevated wool prices drove booms in the NZ economy.
Since globalisation and synthetics the viability of sheep farming has declined but in recent years Chinese processing of NZ wool has started to return viability to sheep farming in addition to higher prices for red meats.
Until recently the cost of shearing sheep was higher than the amount most farmers received for the wool.
I may be biased but prefer wool to synthetic materials for clothing.