Computer users anywhere in the world can join in by downloading a computer model of the climate from www.climateprediction.net.
Because predicting the weather is so complicated, it takes a lot of computer power - and time - to do.
Everyone who joins in will get a different result, and the scientists want to put them all together to figure out the most likely one.
The program will run in the background of any computer using it for between six weeks and four months.
If you do use the program, it won't slow your computer down, as it will only work when you aren't doing anything else.
You can download the program by clicking on the link at the top right of this page.