Quick tips

Clean up after your pets
If you have a dog, either double bag its poo and bin or bury its waste in the garden.

Don't use patio-heaters or electric lights
In the garden, citronella candles will keep insects away, so you don't need to expend energy on electric lights.

More tips

Compost your garden and kitchen waste
Food and garden waste like vegetable peelings, grass and plant cuttings can be turned into compost.

Don't pour hazardous waste or chemicals into outside drains
Outside drains lead directly to local rivers or the sea, so anything you pour in them will end up affecting wildlife. Inside drains lead to a sewer or septic tank, although hazardous waste should not be poured down these either, as they can affect the effectiveness of the system and harmful chemicals may still be released. Chemicals and hazardous waste should be disposed of in local authority facilities like the local dump.

Farm worms
As strange as it sounds, wormeries are alternatives to compost heaps. You simply put your organic waste in them (vegetable peelings, grass cuttings etc) and the worms convert it to compost and fertilizer for your garden.

Minimise the use of fertilizers and pesticides
The more chemicals you spray on to your garden, the more chemicals are going into the ground. Do you really need to use a chemical deterrent?