An increased number of wildfires is one of the scenarios predicted under climate change. Warmer temperatures lead to more evaporation and drier soils—perfect conditions for wildfires. Especially out West, warmer temperatures mean that snow melt happens earlier (if it builds up at all) which means soils are drier for longer—extending fire season. At the same time, an indirect climate change threat in the form of an increase in tree killing insects have left behind a lot of dead plant matter for fires to feed on. So now when a fire breaks out, say, after a lightning strike, the conditions are such that it can burn hotter and spread further. Similarly, the introduction of invasive species in the United States, most notably cheat grass, has also given actual fuel to the fire. Cheat grass seeds in the fall, grows through the winter, and by June it's lifecycle is more or less done, leaving behind a dry woody plant that is perfect forest fire fodder. Perhaps most critically, the plant doesn't mind fire, so after fires sweep through a region it is one of the first to reseed itself, leaving behind a landscape that is even more likely to burn.