The Jones family of Jacksonville would like to live more sustainably by reducing their fossil fuel use. They already carpool and have reduced their electricity use. In addition to what they are already doing, which of the following would be most helpful in further reducing their fossil fuel use?

Removing most of the grass in their yard and replacing it with a vegetable garden.
Consuming more farm-raised beef and reducing the amount of vegetables they eat.
Fertilizing their yard more frequently and watering to encourage grass to grow.
Planting exotic shade plants in their yard and hiring a lawn care company to tend them.