Small changes that makes a difference:
Refuse to buy products that are made of plastics or other materials that are not fully recyclable, look on the containers to see if they are recycable.
Some items that are not and end up in our landfill:
aerosol cans, made from several kinds of metals and plastics.
juice boxes, made from a combination of plastic, cardboard, and aluminum foil.
squeezable plastic ketchup (and mustard and other products) bottles, made from several different kinds of plastic molded together.
Look for the symbols. Another way: If the product or package is made from cardboard, such as a box of cereal or crackers, there is an easy way to tell whether it has been recycled. Peak under the top flap. If the underside of the cardboard is gray or dark brown, the box is made from recycled material.
Whenever you have a choice, always choose the product made from recycled material. 
Janet