Use a reusable calendar.
Many of us use calendars in our daily lives. I use my phone calendar, a flip calendar, and a huge blotter calendar.
The phone calendar reminds me of daily events, the flip calendar is used for birthdays and important yearly reminders, and the blotter calendar is used for bills.
Obviously, my phone calendar and flip calendar are reusable year after year. However, my blotter calendar is paper and must be replaced every year. In order to stop wasting paper, I will look for a wipe off monthly calendar I can use for bills. Since everything is tracked electronically now, I do not have to worry about keeping a copy, since I can pull up past statements at anytime to show what payments I have made.
If you use any paper calendars, consider replacing them with a more eco-friendly alternative.