Recycling cardboard is one of the most important and easiest ways to reduce landfill waste and save energy and natural resources. Every ton of cardboard recycled conserves more than a full barrel of oil and over 6.6 million BTUs of energy, according to Waste Management. When recycling cardboard boxes, be sure to break them down flat and remove items like plastic wrap, plastic ties, packing peanuts and bubble wrap. If the forecast calls for rain on recycling day and you can't prevent cardboard from getting wet, don't worry. It will still be picked up and recycled. But just be sure cardboard does not have any food waste or grease; that's contaminated and cannot be recycled.