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“There is no quality in this world that is not what it is merely by contrast,” said Herman Melville. He meant that the lives we think we’d love, lacking contrast, would be miserable. 
Cohen explains that population, economics, and environment are a dynamic, interconnected system – and that no single element holds the key to solving the world’s problems.
1 min
with
Signs often have an effect opposite to that intended. The problem is that to persuade people not to do something, you first have to raise the issue, increasing its salience in their minds.