With oil you have the occasional catastrophe where you poison a whole gulf, and leaky pipelines. Not to mention the massive damage caused by the extraction from

With oil you have the occasional catastrophe where you poison a whole gulf, and leaky pipelines. Not to mention the massive damage caused by the extraction from tar sands. With coal you have open pit mining for lignite like here in Germany, with runoff poisoning rivers, Mercury pollution from burning it, and for bituminous coal which is mined underground you have to keep the mines clear of the groundwater literally forever or risk poisoning the local water supply.