Massive quantities of spruce forests have in the last few decades been under attack by a tiny insect called the spruce bark beetle. The destruction caused by outbreaks of these beetles has turned it into a pest insect of major global economic importance. But there is a dilemma. The spruce bark beetle is native to many of the regions it is now destroying. And its effects on forests only recently started to become a problem. So could these bark beetles are actually not the root of the problem, but in fact a symptom of something else? In "The Value of a Forest " we join one of the world leading experts on bark beetles to search for answers.