How can mem­bers of the De­part­ment of Phys­ics con­trib­ute to a re­duc­tion of CO₂ emis­sions? How is suc­cess­ful re­search and teach­ing pos­sible without ad­van­cing global warm­ing? Since spring 2020, the CO₂ work­ing group headed by Pro­fessor Nik­las Beisert has dis­cussed these ques­tions and pro­posed suit­able meas­ures.