Our new #PlanetaryBoundaries paper is in memory of Will Steffen. It was a huge loss when he passed away while we were working on it.

We had worked together on redefining our approach to functional biosphere integrity. It is now based on the total energy flux into the biosphere and human interference with it. 

And so it was fitting when yesterday, close to midnight, Australian ABC radio called to ask for an interview - and I could publicly credit Will Steffen's contribution in his home country.

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