Part $1$: The Three Dimensions of Sustainability $(10$ pts$)$

From the Post Carbon Institute's What is Sustainability:

Sustainability is often thought of as composed of three overlapping, mutually dependent goals:

a$.$ To live in a way that is environmentally sustainable, or viable over the very longterm,

b$.$ To live in a way that is economically sustainable, maintaining living standards over the long$-$term, and

c$.$ To live in a way that is socially sustainable, now and in the future.

Explain the importance of each of these dimensions in your own words.

Which dimension$($s$)$ of sustainability were you most familiar with prior to starting this course? How did you gain knowledge about this dimension? Why did this dimension become your priority?