It is not like humanity can survive without some level of carbon dioxide in the atmosphere. The real problem comes when the natural equilibrium between processes that leads to emission and those that remove it from the atmosphere becomes disrupted as a result of anthropological activities
Well said @gentleshaid, that is the real problem and researchers are making various efforts to reduce carbon dioxide emission.
Campaigns can only be made to show people the debilitating effects of continued emission. Research can also be made see how the gas can be artificially sequestrated.