Over the past year, revelations about what the giants of the US petroleum industry knew decades ago about climate change have had a familiar ring to them.
Several observers picked up an echo of the same pattern that forced the American tobacco industry into a multi-billion-dollar court settlement in the 1990s: trying to cast doubt on the risks of the product, and denying publicly the hazards their own scientists told companies about privately.
Turns out there may be a reason for that.

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