Another article, entitled "Europe's Plan to Simulate the Entire Planet", discusses this issue in slightly more detail, without requiring a subscription. It can be found here: "<a href="http://www.technologyreview.com/blog/arxiv/25126/" rel="nofollow">http://www.technologyreview.com/blog/arxiv/25126/</a>.
The actual paper itself can be found at "<a href="http://arxiv.org/abs/1004.4969" rel="nofollow">http://arxiv.org/abs/1004.4969</a>.