Jul 1, 2014

Playing with Fire: How Climate Change and Development Patterns Are  Contributing to the Soaring Costs of Western Wildfires

by
Rachel Cleetus and Kranti Mulik
,
Union of Concerned Scientists

Key findings include:

  • Temperatures in the American West have gone up quickly. Since 1970, they have increased by about twice the global average.
  • Snow melts earlier in the spring. Hotter, drier conditions last longer than they used to. The result is a longer wildfire season and conditions that are primed for wildfires to ignite and spread. 
  • The western wildfire season has grown from five months on average in the 1970s to seven months today. The annual number of large wildfires has increased by more than 75 percent.
  • This is a recent and dangerous alteration of the natural, long-standing, and necessary role of wildfires as part of the forest landscape. 
  • The threat of wildfires is projected to worsen over time as rising temperatures lead to more frequent, large, and severe wildfires and longer fire seasons.
  • Since 1970, regional temperatures have increased by 1.9 degrees Fahrenheit. By mid-century, temperatures are expected to increase an additional 2.5 to 6.5 degrees Fahrenheit.