9/13 Discussed with Stuttgart: one suggestion to define the start of the Anthropocene is to take the 1950s, when for the first time, Plutonium appears globally in sediments. I think: we will not know for another hundred thousand or a million years what actually happened on a planetary scale when humans appeared, and what will be our unmistakable signature. Also: how objectively happy were people in times we may now consider rather bad, e.g. the industrial revolution? Also: there is no such thing as garbage.