There isn’t time to give you a full rundown of the Earth Day shopping opportunities I was alerted to this past week.They included deals on buying bottled water and earth­friendly diaper wipes.

　　My award for the silliest promotion：a plan to gift 25 of the most environmentally

　　conscious

　　stars

　　unique，useful

　　and fabulous “green” products and services，including skin care products，cat litter，cheesecake and artwork.My guess is most of the stuff will end up in celebrities’ garbage.

　　Is buying and selling a good way to celebrate and protect the environment？I would argue that Earth Day might be an occasion to consider giving up purchases or habits that are environmentally questionable or that we could happily do without.How about not buying bottled water，but refilling a water bottle？How about not buying foods—even “organic” foods—that are packed in non­recyclable plastic?

　　Don’t get me wrong.Bridgestone is celebrating Earth Day by promising to repurpose a spent tire for every tire that it sells.Verizon will plant a tree for each cellphone you trade in.Some coffee stores will even refill reusable mugs at no charge.Target is giving out free reusable carrier bags without requiring a purchase.

　　But few retailers are taking the next step—charging a fee at the cash register for disposable plastic bags，a common practice in Europe—to motivate customers to use those new reusable carriers.

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