Write zero conditional sentence

One of the greatest challenges of our time, humanity is facing today are soldiers and military conflicts. Some countries unleash them to improve their economic situation and reduce such in another country. In addition, the cause of armed conflicts are the terrorist acts of religious groups. However, wars and military conflicts, tend to cost the lives of many people and are devastating. Army bombarded and shelled the territory, destroying towns and villages. Soldiers and civilians bear heavy losses. Many of them are wounded, killed, prisoners or hostages.

One of the greatest challenges of our time, humanity is facing today are soldiers and military conflicts. Some countries unleash them to improve their economic situation and reduce such in another country. In addition, the cause of armed conflicts are the terrorist acts of religious groups. However, wars and military conflicts, tend to cost the lives of many people and are devastating. Army bombarded and shelled the territory, destroying towns and villages. Soldiers and civilians bear heavy losses. Many of them are wounded, killed, prisoners or hostages. Some people remain missing. Often civilians to flee their homes and become refugees. In such situations, only a peaceful settlement of the conflict can save the world.