Fossil fuels are hydrocarbons (an organic compound consisting of hydrogen and carbon) that have been formed over very millions of years in the earth’s crust from the remains of dead plants and animals that have been subjected to enormous heat and pressure.  They generally include crude oil, coal, natural gas and heavy oils.  Byproducts of fossil fuels that we use to heat our homes include propane and kerosene.  Choose a post below to get started.