Not Using Dryer
Drying clothes is an activity in which everyone does every day. Most people are lazy and will just toss them into the drying machine to do the work. To be more eco friendly, one can hang their clothes on a rack in their backyard, instead of using all the energy needed for the drying machine to work. By hanging one's clothes outside, one is avoiding the unnecessary use of energy to power their drying machine.
Conclusion: No dryer = less energy (fossil fuels) used
How it saves money: avoiding the use of a drying machine. Resulting in a lower energy bill.