I've been thinking more about light bulbs (sad I know). We really should start giving low energy light bulbs as presents. You've wondered hard and long what to get granny for her birthday? Well, why not replace all her bulbs with nice low energy ones? It'll be ages before they need replacing again (less chance of her falling off the chair trying to do it herself) and her electricity bills will go down.

On a related issue, have you ever wondered why shops leave their lights on overnight? Do you ever feel the need to nip up the High Street and window shop at three in the morning? Most of us could see what's in the window by means of the street lights anyway. So, why don't we start asking shops and stores to turn their lights out? It would an amazing saving in electricity and carbon emissions. There would also be less light pollution. I remember reading something a little while back about a study on our local bats. It seems they don't like flying about when it's too light and it seemed that general background levels of lighting were starting to be too high for them. The avid astronomers amongst us would be happier too.

So, buy your granny some low energy light bulbs for her birthday, switch off in your office or shop and see if you can spot any bats!