The secret to scooping ice cream is all about the scooper. You have to dip it in water before and after every scoop. Then it just rolls off.
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What we know is that the environmental movement had a series of dazzling victories in the late '60s and in the '70s where the whole legal framework for responding to pollution and to protecting wildlife came into law. It was just victory after victory after victory. And these were what came to be called 'command-and-control' pieces of legislation.