Take time to work out how much you need before making a purchase. If you do this for items such as food and paint you'll avoid paying for quantities that will only go to waste.
Replace at least part of your lawn with a meadow as a wildlife habitat, and cut down on the need for watering.
Sprinkle dry tea leaves to deodorise problem areas such as your cat litter tray.
Take holidays closer to home and avoid air travel if you can to reduce your carbon footprint.
Choose rechargeable batteries and a battery charger to cut down on disposables. Eventually recyclable batteries reach the end of their life too but they can be recycled – local recycling policies vary so check with your recycling facility.
Use dried tea leaves as a deodoriser. Scatter them over the carpet, leave for ten minutes then vacuum up. Place in the fridge to absorb odours (like baking soda).
If you only need a tool or piece of equipment infrequently then instead of buying one, save resources by asking a friend or neighbour if you can borrow one. Or check online for a lending club, such as Streetbank.