the answer is because of oil spills.
Nature pumps it's own oil from the ground into many areas. Indians used this goo for different purposes.
Pollution that comes from only one source is called point source pollution. This type of pollution is often easier to identify and regulate compared to non-point source pollution, which comes from multiple sources.
Point-Source Pollution
Methane is a common source of natural groundwater pollution. It can seep into groundwater from natural deposits or from human activities such as oil and gas drilling. Methane contamination can affect water quality and pose risks to human health.
When the single source of pollution can be identified, it's called
If the pollution comes directly from the oil well, e.g. the well is on fire, it will be considered as a point source, becasue we know the source.
industry
power plants
cars
roadways
point source pollution
Oil Spills.
The main source of plastic is Crude Oil
Oil is the main source of electricity worldwide.
Oil
oil
Burning of fossil fuels (coal, oil and natural gas) in industry, transport and the generation of electricity is the main source of air pollution, in the form of carbon dioxide (CO2) (a greenhouse gas classified as a pollutant when it is added to the atmosphere).