Professor Paul J. Crutzen died on 28 January, 2021, at the age of 87 years. The Dutchman was Director of the Atmospheric Chemistry Department at the Max Planck Institute for Chemistry in Mainz, Germany, from 1980 to 2000. Together with Mario J. Molina and F. Sherwood Rowland he received the 1995 Nobel Prize for Chemistry for identifying how nitrogen oxides erode the Earth’s ozone layer and discovering chemical processes that cause the ozone hole.
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Featured image: Soil profile showing peat accumulation above a stone, almost certainly human-placed, at the Machrie Moor Standing Stones site on the Isle of Arran, Scotland. July 2019.