Gas leaks are no joke. The gas can be extremly harmful to inhale and natural gas can cause great damage. You might have a gas leak if:

Dead Plants: Are plants in a certain area of your yard dying or already dead?
Hissing sounds: Hear a hissing sound near your stove? It could be a leak.
Old Line: If your gas line has been in service for a long time, you may need to consider replacement.

If there is a gas leak in your home, switch off all electricity to your home and get to a safe location. Call your gas company to report a leak.