Reduce what you purchase and what you consume. We are constantly bombarded with new gadgets, new information, and single serving/single use items. Reduce the amount of products and information that you consume for a simpler life. Examples of this: reduce your media consumption to focus on real-life interactions; reduce the amount of plastic water bottles that you use to help the planet (less energy to make the bottles, less pollution when getting rid of the bottles, less money to spend on the bottles).
Reuse what you already have or what you are purchasing. If you can reuse an item multiple times before discarding it, it will not only help your wallet, but will also help the environment. Example: Use a refillable water bottle that you can reuse over and over again.
Recycle what you can once you are done reusing it. Sometimes things break or it is time to discard them. When that time comes, try to recycle that product. Again, it goes back to energy production to make a product AND not polluting the world we know with more junk. If we keep making new things and only dispose of our old things via junk yards and landfills, eventually we will run out of space and ruin the earth. Examples: Donate clothes and toys to charity (even though you may have outgrown these items, it doesn’t mean that someone else can’t use them); recycle plastic bottles, cans, etc.