Global Cool is challenging filmmakers to create a five-minute short film on global warming.

The UK based climate change charity will showcase the work of aspiring filmmakers by having them create films that make a difference. The contest is open to any genre, live action or animation, and welcomes any perspective on global warming.

Global Cool wants to get people thinking about climate change and to further their ten-year commitment to inspire 1billion people to reduce their personal CO2 emissions. This competition is another avenue to build awareness and spread the word.

After the June 30 entry deadline the films will be available on SceneWon.com for public voting and public commenting. The top ten films with the most votes will win a cash prize, as will the films with top reviews.

And as a special prize, Global Cool ambassador Sienna Miller will pick the 'cool film of the month' whose filmmaker will get a pair of eco-friendly, Worn Again shoes.

Online video contests and user generated content are hot right now and I don't see it cooling off any time soon. It can be difficult to get entries that stay within the criteria for these type of contests (many don't meet the required length and are often times over), but five minutes should be long enough for one to make a statement on climate change. I'm anticipating a lot of documentary-style entries, but would like to see some narrative or animation pieces thrown in the mix. I'll keep an eye on this contest and feature my favorites when entries go online.