Answer: Global warming
Explanation: fossil fuel are all forms of natural gas example includes crude oil.
Mining operation of coal could lead to run off of chemicals into stream leading to water pollution.
Gases released from the use of fossil fuels are of great threat to the environment. Large amount of CO2 is been released by burning of fossil fuels, this CO2 absorb heat from sunlight leading to global warming.
It also causes air pollution, gases are releases from oil nd gas wells and from its processing into the environment.