WWF/ Seasonal Attribution Project
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Welcome to the Seasonal Attribution Project...
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Recent extreme weather events have prompted the debate about effects of human activity on the world's climate. Now you can help us to determine the extent to which extreme weather events like the United Kingdom floods of Autumn 2000 are attributable to human-induced climate change. We invite you to download and run high-resolution model simulations of the world's climate on your own computer. By comparing the results of these simulations, half of which will include the effects of human-induced climate change, and half of which will not, we will investigate the possible impact of human activity on extreme weather risk. Thank you for your help, and please join the project!

This project has been developed under the climateprediction.net project with support from WWF International. If you are already running one of climateprediction.net's experiments, or the BBC Climate Change Experiment, then PLEASE allow your current experiment to finish before starting your Seasonal Attribution experiment. This project has fairly high computing requirements, including 1GB RAM: if your computer does not meet these, we suggest you try one of the main climateprediction.net experiments.

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21 December, 2007
Please note that no new work will be issued for the Seasonal Attribution project from this site. But, we will be migrating this project to the main site at Climateprediction.net as soon as possible, and some hadam3 models have already become available there. We also plan to move on to the next phase of this project shortly.
We'd like to thank all our participants for their valuable work so far.


30 May, 2007
In the past few months we've been doing analysis of the results from the project. In light of this analysis we've decided to extend the project even further! This will again be a small extension, similar to the extension in January 2007, and will help us to study some of the more interesting issues that have emerged from this project, and have more confident final conclusions. It also means anyone waiting for new simulations to crunch will now have something to work on!

11 April, 2007
Simulations from the extension to this project are no longer available for download (in fact the last ones were sent out a few weeks ago). This means this project is now slowly coming to a close. For participants still running simulations, don't worry! - we'll still be accepting you results for a few months yet. Thanks once again to everyone for taking part and, as always, if you want to keep contributing your computing time to climate modelling projects then we encourage you to join the main climateprediction.net experiment.

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Please note: System Requirements

Please note that because this project uses a high-resolution climate model, it has fairly heavy CPU and Memory requirements:
  • CPU: Pentium 4, 2.4GHz (or equivalent, or higher!) is the minimum CPU suggested to complete a single simulation in under 4 weeks if run continuously. Slower processors will take longer.
  • RAM: 1GB of RAM is suggested, as the simulation takes up typically between 150-450MB of memory.
  • Disk space: 500MB of hard disk space should suffice.
  • Supported platforms: Windows XP/2000/NT and Linux.

If your computer does not meet these requirements then we suggest you try one of the main climateprediction.net projects.

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