One way you can help the planet is by not throwing away gadgets and devices that are still functioning properly. You might be in the habit of changing your phone every year but is that really necessary when the one you have is perfectly working ? Also, if some problems have seeped into your phone and you can’t use it anymore, it might still work in some other ways like a music player, baby monitor or a security camera.
If you have an old laptop, it could be given to an elder or a kid in the home who is new to technology and wants to learn the basics of it. A laptop can also be used as a Chromebook, smart home hub, etc.