A threat is a declaration of one’s intention to inflict pain, injury, harm, punishment, damage or any other hostile action on someone if they do not do what you want them to do. Anything or anyone that is likely to cause damage is a threat to you.
On the other hand, a threat can also be whatever that could stand in your way of success in anything you are doing. For instance, anything that could pull your business profit down is a threat. Again, global warming and climate change are a threat to crop yield and food availability in general. A polluted environment is a threat to the health status of those who reside there.
All in all, anything that can hinder your advancement or bring you pain and harm is a threat.
Annie Watson