The Spanish mountain fire is one of the worst fires in 20 years. Cause of fire: The weather is too hot and manure is spontaneously ignited.

In response, the National Park Service also stated that spontaneous combustion occurs when combustible materials (such as piles of hay, compost, or manure) are heated to a temperature sufficient to cause combustion. CNN said that this week, not only Spain was swept by the heat wave, temperatures in all parts of Europe reached the highest level in history, and it is expected to continue to climb. On the 27th, the French National Weather Service issued a "red" warning to four cities in the south of the country. This is the first time this level of warning has been used in France for high temperatures.