The use of paper receipts in stores not only harms the environment, but paper for printing checks contains a very dangerous substance - bisphenol-A (BPA). This substance is very quickly absorbed into the skin, penetrating directly into the circulatory system, which carries the poison throughout the body.

 A failure in the endocrine system and, at a minimum, obesity, which we hate, asthma, vascular and heart diseases, and immune problems.  

Also harms the environment in the form of chemical pollution, and reduction of forest cover.