Eliminating paper receipts is a great way to cut waste. Many stores now offer the option of having your receipt emailed to you, and this little step can add up to big savings for the planet. Switching to digital receipts in the U.S. alone could save more than 9.5 million trees and save 1.2 billion gallons of water used during the receipt-paper production process. So next time you’re asked if you’d like that receipt printed, say “No, thanks!”