The present disclosure relates to systems and methods for creating and maintaining modified and controlled atmospheres (MA/CA) in a rigid sealable container having at least one refrigeration unit with an integrated oxygen reduction structure. The refrigeration unit provides the necessary ambient atmosphere movement for the oxygen reduction structure, such as a hydrogen fuel cell. The systems and methods are useful in the, storage, transport, distribution, processing and packaging of fresh perishables with a focus on altering the natural gaseous environment around the perishables such that fresh shelf-life is extended. The systems may operate in a power generation/power production mode, such that the fuel cells maintain the MA/CA environment while providing both primary and back-up power.