New York City's metro card system has eliminated tokens altogether, and those plastic cards can sometimes have small balances left on them going unused. One organization, the Next Stop Project, collects these low-balance cards and combines them to form full-fare cards that are donated to New Yorkers in need. Whether you're a full-time NYC resident or are planning to visit for work or vacation, don't toss cards that have value left on them. Learn more at nextstopproject.org.

Here's one reason to keep a can of tuna in your car: If you've ever seen a lost (and scared) dog or cat who runs the risk of being hit by a car, the best thing you can do to help is to try to lure the animal into your car. If you feel the animal is not a risk to you, the strong smell of fish can entice it to trust you and jump into your car. Be sure to have a can of tuna that doesn't need a can opener. When you do have the animal in your car, bring it to an animal shelter to be scanned for a microchip.

It may seem harmless, but those little stickers you find on fruits and vegetables can wreak havoc on drains and at wastewater treatment plants. Before washing fruits and veggies, take the time to remove the stickers and put them in the trash. When they accidentally get washed down the drain, their adhesive can stick inside drains and pipes. If they get past that point, they get caught in screens and filters at water treatment plants. It may not seem like a big deal, but if you think about the amount of produce that's stickered, it adds up.