In the following question, there are six parts marked S1, S6, P, Q, R and S. The positions of S1 and S6 are fixed. Some parts of the sentence have been jumbled up. Rearrange these parts and choose the proper sequence from the given options.

(S1) Aviation is several times more responsible for polluting the environment

(P) Than any other mode of transport

(Q) And to combat this menace, several countries have

(R) What is known as green tax, which levies a fee for the amount of carbon

(S) A passenger is supposedly releasing

(S6) while undertaking an air travel.