Use what you already have: 

Many of us are guilty of finding something new to try and throwing out an old product we may not want to use anymore. Now, this may be because it is not the right product for you, but that doesn’t mean it should land in the dumpster. Eco-lifestyle expert Ashlee Piper says, “If something isn’t your color or isn’t working for you, consider selling it on Poshmark, offering it up to your neighborhood Buy Nothing Facebook group (makeup, even used makeup, goes like hotcakes in my group), or giving some to a friend who loves to experiment with new-to-them products.”

Buy things made with less plastic packaging:

Packaging is a great place to start in terms of cutting back your carbon footprint. “What you want to look for is something that has compostable, easily recyclable, refillable, or reusable packaging—or better yet, no packaging,” Piper said.