S1 : It is doubtful if mankind, through out his long history, has ever lived at all ‘sustainably’. 
P : But in general mankind has regarded the environment as an endless ‘resource’ to be exploited and plundered. 
Q : May be a few isolated tribal groups found the necessary balance with nature lived without the desire for endless ‘more’. 
R : Now we have reached a point where we are on the verge of destroying ourselves and most of the life on earth. 
S : This process has accelerated greatly since the industrial revolution. 
S6 : The concept of ‘sustainable’ is so far from reality that it is almost laughable.