What are the three main components that contribute to tree risk?

The three main components that contribute to tree risk are the likelihood of failure, the likelihood of impact, and the consequences of failure. This approach is rooted in a comprehensive risk assessment framework, which considers not just whether a tree might fail but also the potential effects of that failure.

Likelihood of failure assesses the probability that a tree will experience structural failure due to factors such as disease, decay, or environmental stressors. The likelihood of impact evaluates the probability that a failure will occur in an area where it can cause harm to people, property, or other trees. Finally, the consequences of failure look at the severity and type of damage that could occur as a result of the tree’s failure. This holistic assessment helps professionals prioritize trees for management actions based on their risk profile.

Other components mentioned in the incorrect options can contribute to a tree's health and stability, but they do not directly address the multifaceted nature of risk as structured in the correct choice. While health status and environmental factors may influence a tree's strength or longevity, they are not specific measurements of risk in the same manner as the three components identified.