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The climate effects of burning coal were well known in the scientific community as early as 1856 (Eunice Foote) or 1859 (John Tyndall).

Deliberate misinformation from fossil fuel companies has been around since at least 1991 when they published a film about climate change, "A Climate of Change."

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> The climate effects of burning coal were well known in the scientific community as early as 1856 (Eunice Foote) or 1859 (John Tyndall).

So about 150 to 200 years ago...

> Deliberate misinformation from fossil fuel companies has been around since at least 1991 when they published a film about climate change, "A Climate of Change."

Exxon has actively fought to hide the dangers of climate change since the early 1980s. I think the film you're referring to was called "A Climate of Concern."

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