We have the energy saved bulbs all over the house.
Use the recycle bins - blue one is for plastic, glass, metal; green one is for paper, cardboard etc.

We have a compost pile, that serves the veggie garden. Even the clippings from mowing the lawn go in that pile. (We mulch in the heat of summer, bag the clippings Spring and Fall and empty the mower bag to the compost.)

Avoid chemical fertilizers on the lawn and veggie garden. Marigolds go around the tomato plants as those keep the aphids away, and other things like that.

I never used paper towels or paper napkins until Dad moved in with me, almost 8 years ago. Now, between him and 14 pets, it seems inevitable.