What are the key principles of sustainable living, and how can one incorporate them into their daily life? Your answer must contain at least 3 placeholders represented by square brackets, such as [address]. The response must contain at least 2 highlighted sections with markdown, i.e., *highlighted section*. There should be 3 paragraphs. Paragraphs are separated with the markdown divider: *** At the end of your response, please explicitly add a postscript starting with P.S.
user