Install batboxes, bumble bee nests, nesting boxes for birds.
Put out food (worms, nuts and feed) and fresh water for birds.
Plant a patch of native wildflowers, to encourage insects, butterflies, bees etc.
Stop using chemicals to kill garden pests. Get rid of aphids with a spray of water left over from the washing up if you have used an eco friendly washing up liquid.
from: A Good Life The Guide to Ethical Living by Leo Hackman.