A method for removing carbon dioxide (CO 2) from a gas mixture, said method comprising contacting a gas mixture containing CO 2 and at least one other gas with at least one of: 1) one or more linear (per)fluoropolyether PFPE fluid complying with formula below: T-O-(CF 2 O) a1 (CF 2 CF 2 O) a2 (CF 2 CF 2 CF 2 O) a3 (CF 2 CF 2 CF 2 CF 2 O) a4 -T' wherein: - T and T', equal to or different from each other, are selected from CF 3, C 2 F 5 and C 3 F 7; - a1, a2, a3 and a4, equal to or different from each other, are independently integers ≥0, selected in such a way that a1+a2+a3+a4 ranges from 20 to 220 and a2/a1 ranges from 0.1 to 10, preferably from 0.5 to 2; should at least two of a1 - a4 be different from 0, the different recurring units are statistically distributed along the chain; 2) one or more linear PFPE fluid complying with formula below: T-O-(CF 2 CF 2 C(Hal) 2 O) b1 -(CF 2 CF 2 CH 2 O) b2 -(CF 2 CF 2 CH(Hal)O) b3 -T' wherein - T and T', equal to or different from each other, are selected from -CF 3, -C 2 F 5 or -C 3 F 7; - Hal, equal or different at each occurrence, is a halogen selected from F and Cl, preferably F; - b1, b2, and b3 equal or different from each other, are independently integers ≥0, such that b1+ b2 + b3 is in the range 5 to 250; should at least two of b1, b2 and b3 be different from zero, the different recurring units are generally statistically distributed along the chain. 1) one or more linear (per)fluoropolyether PFPE fluid complying with formula below: T-O-(CF 2 O) a1 (CF 2 CF 2 O) a2 (CF 2 CF 2 CF 2 O) a3 (CF 2 CF 2 CF 2 CF 2 O) a4 -T' wherein: - T and T', equal to or different from each other, are selected from CF 3, C 2 F 5 and C 3 F 7; - a1, a2, a3 and a4, equal to or different from each other, are independently integers ≥0, selected in such a way that a1+a2+a3+a4 ranges from 20 to 220 and a2/a1 ranges from 0.1 to 10, preferably from 0.5 to 2; should at least two of a1 - a4 be different from 0, the different recurring units are statistically distributed along the chain; - T and T', equal to or different from each other, are selected from CF 3, C 2 F 5 and C 3 F 7; - a1, a2, a3 and a4, equal to or different from each other, are independently integers ≥0, selected in such a way that a1+a2+a3+a4 ranges from 20 to 220 and a2/a1 ranges from 0.1 to 10, preferably from 0.5 to 2; should at least two of a1 - a4 be different from 0, the different recurring units are statistically distributed along the chain; 2) one or more linear PFPE fluid complying with formula below: T-O-(CF 2 CF 2 C(Hal) 2 O) b1 -(CF 2 CF 2 CH 2 O) b2 -(CF 2 CF 2 CH(Hal)O) b3 -T' wherein - T and T', equal to or different from each other, are selected from -CF 3, -C 2 F 5 or -C 3 F 7; - Hal, equal or different at each occurrence, is a halogen selected from F and Cl, preferably F; - b1, b2, and b3 equal or different from each other, are independently integers ≥0, such that b1+ b2 + b3 is in the range 5 to 250; should at least two of b1, b2 and b3 be different from zero, the different recurring units are generally statistically distributed along the chain. - T and T', equal to or different from each other, are selected from -CF 3, -C 2 F 5 or -C 3 F 7; - Hal, equal or different at each occurrence, is a halogen selected from F and Cl, preferably F; - b1, b2, and b3 equal or different from each other, are independently integers ≥0, such that b1+ b2 + b3 is in the range 5 to 250; should at least two of b1, b2 and b3 be different from zero, the different recurring units are generally statistically distributed along the chain.