BIG BAD WOOD / NAT GEO

From power lines to irate neighbors and everywhere in between, urban tree-cutters encounter things that forest loggers wouldn't dream of. Big Bad Wood follows four urban tree-trimming companies--each one more different than the other--as they take a hack at some of the most extreme situations in their industry. But up in the tree, there are no second chances. One wrong move could cost them thousands of dollars in property damage--or their lives.