In the modern era (and for Western cultures) there was a cognitive revolution that started around the time of Carl Sagan's Pale Blue Dot moment. The Planetary

In the modern era (and for Western cultures) there was a cognitive revolution that started around the time of Carl Sagan's Pale Blue Dot moment. The Planetary Boundaries concept is in a sense the evolution of that initial internalization, the beginning of a more analytical approach towards long-term sustainability (a first UML diagram of our predicament if you wish).