Natural gas is the earth's cleanest fossil fuel and it's colorless and odorless in it's natural state. It is composed of four hydrocarbon atoms and one carbon atom.
Advantages:
Natural gas is environmentally friendly because it burns cleaner then other fossil fuels.
It's safer and easier to store when compared to other fossil fuels.
Natural gas is extremely reliable, unlike electric power that can be knocked out during a storm.
Disadvantages:
Gas is highly flammable, which means leaks can result in explosions.
Natural gas is toxic.
Gas infrastructure is expensive, pipelines cost a significant amount of money to construct.