The phrase "world reasons" can be replaced with a variety of synonyms depending on the context and meaning behind it. Some viable alternatives include "global rationales," "universal motives," "earthly justifications," "international explanations," and "planetary causes." Depending on the intended message, each of these synonyms adds a slightly different connotation to the original phrase. For example, "global rationales" implies a sense of universality and broadness, whereas "planetary causes" suggests a connection to the physical world and natural events. In general, using a synonym for "world reasons" can add depth and nuance to written or verbal communication.