evidence: The paper, authored by German researchers and featured in a sensational Daily Mail article that described the findings as "explosive", reviewed numerous studies regarding carbon dioxide (CO2) exposure and face masks. [...] Running through those findings, Dr Trauer told CheckMate he was "happy to accept" that masks increase the amount of carbon dioxide inhaled by wearers and that — based on the studies listed — they "probably" increase the concentration of CO2 in humans. [...] Finally, the Daily Mail article prominently features a link to another story which alleges that "wearing a mask can expose children to dangerous levels of carbon dioxide in just three minutes".