Have you ever considered mushroom farming as a career? Like any other business it takes attention to detail, dedication, and a pretty healthy start up period to get your crop established. But the potential riches are there and some countries like Spain are using mushrooms as a way to revitalize their countryside. 
Spain has become the world’s truffle capital. The black truffle (tuber melanosporum) is being used to regenerate a region in Spain that has suffered from depopulation and lack of investment. The region’s soils and weather are not particularly wonderful. Fortunately, the mushrooms don’t care.
They do care about where they grow and other conditions such as elevation, soil conditions, and more. Truffles grow on the roots of certain Oak and hazel nut trees that have been inoculated with a specific mycorrhizae. One can buy inoculated seedlings fairly easily and our Mediterranean environment is quite mushroom friendly.
Why go to the bother? The black truffle is a culinary treasure often called “Black diamonds.” They are considered to be worth their weight in gold (almost literally). There is something appealing about holding a single fist-sized mushroom worth over $300.00 and know there is an almost insatiable market. The potential pay back for the investment has been described by some as if ‘your community won the lottery.’ 
While truffles might not be the answer for everyone, there are different types of mushrooms, each with different characteristics, markets, and associated values. Mushrooms are even being grown in urban environments. Portland Mushroom Company, for instance, was started back in 2012 and grows world-class oyster mushrooms for local restaurants.
Lucky for us Oregon is a paradise for mushrooms where the largest living organism—a honey mushroom—was found. This beast is 3.5 miles across and over 2,400 years old. 
To find out more about starting a mushroom farm see: https://howtostartanllc.com/business-ideas/mushroom-farm
To read more about how Truffles are revitalizing communities in Spain see Black diamonds: How Spain became world's truffle capital.
1 Black diamonds: How Spain became world's truffle capital (https://www.thelocal.es/20181107/black-diamonds-how-a-corner-of-spain-became-truffle-capital-of-the-world)
2 Oregon Mushrooms (https://www.oregonmushrooms.com/)
Business Retention and Expansion (BRE) comes in many flavors. Making sure there is a workforce available to help support your industry is critical and often tough. Log truck driving careers can be a fast transition compared to other trades and pay very well!