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The biggest man-made source of pollution in the world is fossil fuel burning. Some argue that volcanoes produce even more pollution.

Answer:

The "biggest source" of pollution is a difficult term to deine as some pollution (methane and carbon dioxide from digestion and decomposition) are accepted as "normal" as are examples like silt released to rivers through erosion, ozone down-washed from the upper atmosphere, and fecal matter from animals and humans. (Humans alone produce about 7 million tones of fecal matter a day). One also must consider the time frame. In the past volcanoes and super volcanoes have erupted covering millions of square miles with thick layers of ash. A very significant change in Earth's atmosphere about 2.4 billion years ago added a pollutant (oxygen) which almost wiped out the original life forms.

There is also a problem in that "biggest" isn't the same as "most significant" in the same way that a pound of coal isn't as good a gift as a quarter of an ounce of diamonds although it is a bigger gift of carbon.

By volume man made CO2 emissions are certainly high on the list and derive almost equally from Transportation, Industry and Electrical generation. Fecal matter as it affects human drinking water is lower but still significant.

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