Global warfare. Conceptual computer artwork of the Earth as a grenade, representing global warfare. A grenade is an explosive device that is primed by pulling the pin (upper right). After a delay of a few seconds, it explodes. This image can also be used to represent catastrophic global destruction, such as the devastation that would be seen in a global nuclear war. Other events that would cause worldwide loss of life include an asteroid impact and the eruption of a super-volcano.