Assertion: air pollution | /r/CreatedBy | human activity
Facets:
Source sentences:
text: Most of this gets into the air as a result of the burning of fossil fuels such as gasoline and diesel fuel, whereas lesser amounts are contributed by machines that burn fuel with a significant sulfur content (for example, locomotives and ships) and even volcanic eruptions (it is a myth that air pollution is only caused by human activity, even if the natural contribution is relatively minor).