Thank you - I always find your insights valuable. Seen in the light of ecological overshoot, it should be glaringly obvious to anyone who is concerned with the topic of sustainability that we have totally overshot all possible barriers to our civilization and now we live on borrowed time... Once you see mining and manufacturing as a part of our ecosystem (like we were a plant using soil nutrients to build its tissues) it becomes all the more clear how we are at the mercy of the planet sustaining us... At least as long as her mineral inputs from potassium to petroleum last.