In the print version of the May issue, all minus signs in the text and tables of the Letters section were missing owing to a printing error. A corrected version of this issue has been supplied to all our subscribers. The online versions of all Letters are correct.
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The online version of the original article can be found at 10.1038/ngeo477
The online version of the original article can be found at 10.1038/ngeo499
The online version of the original article can be found at 10.1038/ngeo501
The online version of the original article can be found at 10.1038/ngeo467
The online version of the original article can be found at 10.1038/ngeo500
The online version of the original article can be found at 10.1038/ngeo475
The online version of the original article can be found at 10.1038/ngeo470
The online version of the original article can be found at 10.1038/ngeo502
The online version of the original article can be found at 10.1038/ngeo503
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Erratum: Print version of the May issue. Nature Geosci 2, 444 (2009). https://doi.org/10.1038/ngeo548
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DOI: https://doi.org/10.1038/ngeo548
