Winterizing Exotic Trees for cold climates

Tropical trees provide a vacation atmosphere and produce fruits that are delicious to eat.  The problem is that could only survive in specific climates.  Trees that survive in warmer climates typically do not have traditional solid trunks which allows air to permiate and freeze the trunks preventing water and nutrients from the soil to get to the leaves.  If there was a green way to insulate the trunks trees utilizing the sun's rays or wind turbines to convert the energy captured to provide heat to the trunk of the tree.  The tree would be able to survive in cold climates.