The most fuel-efficient way to travel by plane is to go directly from your departure city to your destination without any connecting flights or stops. Often, when booking a ticket online, you'll notice there are flight options that appear to be "direct," but be sure to double-check: A "direct" flight is not necessarily a "nonstop" one. Some direct flights mean the plane will stop at a different destination to deplane and accept passengers, continuing on to your final destination. Only nonstop flights go without stopping.

When it comes to recycling your cans, bottles and boxes at home, the most commonly recycled plastics are the ones marked with a No. 1 or No. 2. But there are certain No. 1-marked plastics -- specifically black plastic microwavable trays -- that are most likely NOT recyclable. The distinction is simple: It's usually marked No. 1s, not just No. 1. This is a different grade of plastic resin that is harder to recycle. Your trash provider should be able to tell you if they accept No. 1s plastics, but if in doubt, toss it.

Once you open a tin can containing food like tomato paste, fruit or sardines, you may think it's fine to cover the opening with plastic wrap or aluminum foil and store it in the fridge. But once a tin can is open, it's not a safe food storage vehicle. Bacteria can grow along the edges of the can in no time at all, and highly acidic foods can take on a metallic taste. If you have leftover ingredients after opening a can, transfer the leftovers to an airtight container. Then be sure to toss the can in the recycling bin.