卡特林娜飓风可能时运不佳，而非人为气候变化迹象。 尽管没有科学的方法将某一场特定的飓风，例如卡特林娜飓风同长期趋势联系在一起，但是，全世界的飓风能量已经显著增加。
While there is no scientific way to link a particular hurricane such as Katrina to the long-term trend – in the sense that Katrina might have been bad luck rather than a sign of manmade climate change – the energy of hurricanes throughout the world has been rising markedly.