A really big step in simple living is realizing that the large homes that are being built for couples or couples with only one or two kids are wasteful on several levels. You can have enough space for everything, and enough privacy, without 700 square feet per person.
I'm not necessarily recommending a tiny house - while that's what we live in right now, that's not our ideal - but many people could stand to downsize their homes.
Enjoy the video, and find my book Crazy Simple on the "Non-fiction books by Emily" tab.