7 Billion

The words "But we don't take up as much space as you'd think.
Standing shoulder to shoulder all 7 billion of us would fill the city of Los Angeles.
So it's not space we need – it's balance" mean to me that if our population reaches 7 billion we need to create the right balance between managing garbage, our space and our differences.

9100000000% Of people in our world do not have clean drinking water.
26600000000% Of people in our world lack adequate sanitation.