There is something exhilarating about the process of filling a shopping cart full of fragrant new crayons and crisp new paper and the coolest backpack characters of the season. Such back-to-school sprees and other school-year habits can be hard on the wallet, though—and the planet. Here are a few ideas to get your school year off to a greener start.

1. Rethink the Carpool Line

Long lines of idling cars every morning is not the most eco-friendly system on the planet, but it is a necessity for many schools and families. You can do a few things, though. Some research suggests that it is actually more fuel efficient to turn your car off and then on again if you are going to be idling for more than 10 seconds. However, that sounds potentially very obnoxious in a pick-up line situation, so perhaps it is better to open the windows and turn off the car simply if you arrive early before the carpool process begins, shaving off a few minutes of carbon-dioxide emissions. Other possibilities include riding the school bus more frequently or sharing the carpool load with another family, taking one car out of the idling-car line.

2. Go Scavenging

As delicious as freshly sharpened, brand new pencils can be, the truth is that kids don't need a new everything in order to learn. Look under couch cushions, in desk drawers and in the bottom of your purse. Sharpen pencils, use cap erasers and even sharpen crayons. Test markers to see whether they need to be disposed of or replaced before raiding the Crayola aisle. Pull out a hand-soap refill bottle with a scent you are tired of to add to the back-to-school supplies box.

3. Buy Durable and Reusable

Rather than going with the latest trends for backpacks and lunchboxes, think outside the replace-every-year mode. Buy something more durable, such as a strong, neutral-colored backpack that you could personalize each year with new sew-on patches or other decorative elements. Or consider a sturdy, hard-sided lunchbox that can be redecorated with cool new stickers every few months providing longevity of at least a few years. Invest in a selection of small, washable containers to use to pack healthy choices with less waste.

Back-to-School Book List

Younger Kids

• "David Goes to School," by David Shannon (Blue Sky Press, 1999, $16.99).

• "If You Take a Mouse to School," by Laura Numeroff and Felicia Bond (HarperCollins, 2002, $16.99).

• "Pete the Cat: Rocking in my School Shoes," by Eric Litwin and James Dean (HarperCollins, 2011, $16.99).

Older Kids

• "Mockingbird," by Kathryn Erskine (Puffin, 2010, $6.99)

• "Harry Potter and the Sorcerer's Stone," by J.K. Rowling (Scholastic, 1999, $10.99)

• "Tom Brown's School Days," by Thomas Hughes (CreateSpace, 2012, $8.99, free on Kindle).

Grown-ups

• "Beyond the Bake Sale: The Essential Guide to Family/School Partnerships," by Anne Henderson, (New Press, 2007, $25).