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Tobacco, Alcohol, gunpowder, illegal drugs (Heroin, cocain, etc), Combustion engines, religions, coal fired power plants, tanning beds. There are more, that's all I can think of atm.

I'd also say one of the worst ones are factories because it sends probably the most CO2 out in the athmosphere.

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∙ 16y ago

What else can I help you with?