Reuse is an alternative to throwing something away or recycling it. It can be either finding a way of using something more than once (see below), or finding a different use for something you have used and finished with.
Steve re-uses a piece of (good quality) aluminium foil as a loose cover for cooking fish in the oven. It stops the fish drying out. No need to wash; just set aside ready to use over and over again. (Aluminium is very energy-costly to produce.)
Take a lightweight metal baking tray about 2 inches deep. Put in some of your preferred cooking oil – not too much, just enough to cover the bottom. Take a fillet of haddock (works for other fish and more than one fillet!) and place skin side up in the tray to oil the fish then place it skin side down (oiling the top keeps the moisture in). Cut some cherry tomatoes in half and arrange cut side down around the fish. Very thinly slice a shallot or half a small onion and mix with excess oil at one side of the tray. Add freshly ground black pepper and soy sauce to the top of the fish. Cover the tray with foil and bake in a pre-heated fan oven at 200°C for 10 minutes. (Times may need adjusting for other oven types.) Serve with pasta and a seasonal green vegetable, and pour the tomatoes onions and juices over the pasta. Put the foil to one side for next time – it won’t be greasy and it doesn’t smell of fish, and any occasional spatters burn on like they do on your metal baking tray.