The phrase "world climate program" can be replaced with a number of different phrases and synonyms that convey the same meaning. Some potential options could include phrases such as "global climate initiative," "international climate campaign," "plan for worldwide climate change," or "effort to combat climate change on a global scale." Each of these phrases emphasize the scope and ambition of the work being done to address climate change, and highlight the importance of coordinated action across borders and nations. Ultimately, the specific phrasing that is used will depend on the context and goals of the conversation or initiative at hand.