It is green (environmental) and saves you lots of money!
If you have not tried making your own laundry soap, here is the recipe I use from the Duggars':
1 Fels Naptha soap bar, grated
1 cup washing soda
1/2 cup borax
Grate the soap bar into a small saucepan. Cover with hot water*. Cook over medium-low heat, stirring continually, until the soap completely dissolves.
Put washing soda and borax in a 5-gallon bucket. Pour in the hot, melted soap mixture. Stir well, until all the powder is dissolved. Fill the bucket to the top with more hot tap water. Stir, cover securely, and let set overnight. The next morning, stir the mixture. Mix equal amounts of soap concentrate and water in a smaller laundry-detergent dispenser or container. Shake before using.
For top-loading machines: Use 1 cup of the soap mixture per load.
For front-loading machines: Use 1/2 cup per load.
Here is my original post:
Homemade Laundry Soap
*On their family website they say 4 cups.