Why is the problem of preserving the world a global problem?

In my opinion, this is due to the fact that if there is no peace on the planet, then the planet will be destroyed by the warring parties, which will enter into this or that conflict for their interests in a certain area and in a specific territory. Peace on earth is a guarantee that the population will continue to live and exist, and not die and participate in wars and conflicts that will take place with the use of force. Peace is the guarantee of peace and security for the entire population of our planet. In this regard, in my opinion, the problem of preserving peace is one of the global ones.