The earth's atmosphere and even the earth itself are part of a system. The system isn't homogeneous obviously. Patterns such as El Nino, La Nina, and polar vortices all play parts in distributing warmer and cooler areas. You can have a redistribution within a system that changes local conditions but stays within systemic norms. The Gulf Stream feeds warmer water north toward Artic regions; it need not always be consistent. In fact, it's either postulated or has been shown that melting Artic ice and glaciers can change sea density and turn off the Gulf Stream which would turn a warmer Artic cooler. Mankind should be rational with respect to the environment, but we also need to quit the nonsense that we alone make changes and we can modify what goes on within the earth's environment.