Recycle, compost, buy organic, recycled, fair commerce, less plastic or none. Save energy, don't change your electronics unless necessary.... every little move, would do a lot for our planet, the Earth, the only we have.
If you do all the actions above you will be the hero. If you do not do anything at all, you will be the villain. Pick one. Of course, you can be something in between. :D
Have a nice day.