Major natural disasters became more frequent and helped change public opinion. One of the deadliest heat waves in human history happened during the 2000s, mostly in Europe, with the 2003 European heat wave killing 37,451 people over the summer months. In February 2009, a series of highly destructive bushfires started in Victoria, Australia, lasting into the next month. While the fires are believed to have been caused by arson, they were widely reported as having been fueled by an excessive heatwave that was due in part to climate change. It has also been alleged that climate change was a cause of increased storms intensity, notably in the case of Hurricane Katrina.