is modifying as a relative clause. This is a subject marker used in relative clauses, and it's interchangeable with . See: How does the work in ?
Imagine this "double-subject" sentence:
>
> As for this way of living, energy consumption is high.
From this, you can construct the following noun phrase with a relative clause:
> ****
> a way of living where energy consumption is high
Which is the same as:
> ****
> a way of living where energy consumption is high
Note that this person is saluting to the itself, not "you" or anyone. The given translation is not wrong as a free translation, though.
Here are some simpler examples. and are interchangeable.
*
a tall person (lit. a person whose height is high)
(cf. He is tall.)
*
an elephant with a long nose
*
a beautiful-minded person