Fossil fuels are formed from the remains of prehistoric plants and animals. Through time, humans found a way to use them as a source of energy to be used for heating, transportation, and electricity.  Burning them causes emission of harmful gases into the air.  This contributes to air pollution which has a detrimental effect on the health of the population.  They can cause allergies, respiratory and neurological diseases, or cancer. They also pollute the bodies of water which can make the water unsafe for consumption of humans and animals.   On the side of the environment, these harmful gases from fossil fuels contribute to global warming.  They also cause acid rain which affects the acidity level of the land and water and can be dangerous for the living things that rely on these resources for survival.   

The most detrimental effect of fossil fuels is the slow deterioration of our environment.  Fossil fuels such as natural gas, petroleum, and coal are deemed to be nonrenewable energy.  The more that humans rely on them for energy, the more that they can cause damage to our environment.  They affect our lands, water, and air not only at the local level but globally.  When this pollution spreads, there is a big concern for the health of the people because we rely on the environment for our survival from the air we breathe, to the water we drink, and the soil that we cultivate for the food that we eat.  This is a serious threat to the population.  It is a good thing that this concern is being acted upon by concerned individuals and groups that advocate for alternative and renewable sources of energy which would be friendlier to the environment and will not endanger the health of the people. Everyone is encouraged to support their cause.