Comment on

• Tibetan plateau aridification linked to global cooling at the Eocene-Oligocene transition.

  Dupont-Nivet G, Krijgsman W, Langereis CG, Abels HA, Dai S, Fang X. Dupont-Nivet G, et al. Nature. 2007 Feb 8;445(7128):635-8. doi: 10.1038/nature05516. Nature. 2007. PMID: 17287807
• Large temperature drop across the Eocene-Oligocene transition in central North America.

  Zanazzi A, Kohn MJ, MacFadden BJ, Terry DO. Zanazzi A, et al. Nature. 2007 Feb 8;445(7128):639-42. doi: 10.1038/nature05551. Nature. 2007. PMID: 17287808