Rockström and co-workers developed the concept of "planetary boundaries" - boundaries needed to keep the planet in a livable state. Three out of nine of these boundaries have been transgressed already: climate, biodiversity and the nitrogren cycle. The paper has been cited thousands of times, showing its urgency. The take-home message is that we should take all these boundaries into account and not just focus on one of them. Read the whole paper in Nature.

 

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