Here’s a great chance to add your personal touch to WWF's Earth Hour by making a short video trailer that will inspire everyone to switch off their lights on Saturday 27 March. And you could win yourself a heap of cash too!

Send us your Earth Hour video trailer by 8 March...

WWF’s Earth Hour is, of course, on Saturday 27 March, but we need you to send us your Earth Hour promo videos by midday on the closing date of 8 March. This will give us time to show the best ones on our website as they come in, then pick a winner, and use your video in our Earth Hour promotions. You can send it even sooner, if you like.

Three simple steps to winning £1,000

1) Make a short video to promote Earth Hour – a maximum of one minute long. You can use any kind of video camera, as long as the picture is decent quality.

2) Upload your video to YouTube – give it a title and description, tag it with the phrase 'EarthHour2010video'. Sign up to Earth Hour, then drop us an email This e-mail address is being protected from spambots. You need JavaScript enabled to view it with your full name and tell us your YouTube video’s url link. No need to send us the actual film at this stage.

3) We watch the videos and, after the closing date of 8 March, decide our overall favourite. We may take account of YouTube viewer ratings, so get as many people as possible to watch and rate your video. The maker of the winning video will receive a first prize of £1,000, and two runners-up will receive £500 each.

Make sure you read our full terms and conditions of entry.

Get creative

Your film can feature you or your friends and family, or be an animation or 3D spectacular (though we’re not expecting that, unless James Cameron wants to get involved) – but it does need to be all your own work. In other words you can’t import bits from other movies, TV programmes or adverts, or use any commercially released or copyrighted music – try YouTube’s free AudioSwap feature to add a suitable soundtrack. Or write and record your own Earth Hour song!

By the way, you shouldn’t use any WWF branding or our panda logo – it should be your personal take on Earth Hour.

Do your own thing – the more inventive, original and thought-provoking the better. Funny is good too. Climate change is a serious subject, but it’s often possible to attract more viewers with something fun or quirky that can be passed around and go ‘viral’… Feel free to submit more than one video if you are feeling particularly creative!

Still stuck for ideas? A few thoughts that might trigger ideas for your video… What will you do during Earth Hour? How will you switch your lights off? What should you not do in the dark…

Or try a lightwriting video...Or whatever else you fancy that will help draw attention to Earth Hour… Have a look at some of  the films and links on this page – some of them official WWF ones, some not…(Just bear in mind the Earth Hour date has changed since some of those older videos were made. The big day this year is 27 March.)

Remember, closing date for video entries is midday 8 March 2010.

And Earth Hour itself is Saturday 27 March, 8.30pm.