Abstract: Regenerable carbon dioxide scrubbers are provided. The regenerable carbon dioxide scrubbers include at least a first housing compartment including an inlet, an outlet, and an interior region. A sorbent material is located within the interior region of the first housing compartment, in which the sorbent material (a) attracts and/or retains carbon dioxide from an air supply passing through the sorbent material at an operating temperature below about 100° C., and (b) releases carbon dioxide at a regenerating temperature above about 150° C. Rebreathers including the regenerable carbon dioxide scrubbers and methods of scrubbing carbon dioxide from a user's exhaled air are also provided.