Coal and natural gas is are considered fossil fuels why are these types of fuels considered non-renewable

Fossil fuels are the energy of the past. ... According to the US Energy Information Administration (EIA), “Coal, crude oil, and natural gas are all considered fossil fuels because they were formed from the buried remains of plants and animals that lived millions of years ago.”

Explanation:

poor water quality affects most estuarine organisms, including commercially important fish and shellfish. the pollutants that have the greatest impact on the health of estuaries include toxic substances like chemicals and heavy metals, nutrient pollution (or eutrophication), and pathogens such as bacteria or viruses.