美国加州为什么那么多森林火灾？

您真是博爱，连这样的事都在百忙之中关心了。。。大家继续，我该去寻找自己明天的午饭了。。。

自然火灾。
人为 的很少

气候变化，气侯变暖

参考：Scientists have already tied increased frequency and intensity of wildfires to the changing climate, and scientists are confident that the conditions that will be brought on by global warming will only make conditions more ripe for wildfire. Forest management practices -- like the fire-suppression techniques that left tinder-dry brush and wood littered across the Western landscape.

In a scientific paper published a year ago co-authored by Tom Swetnam of the University of Arizona's Laboratory of Tree-Ring Research, and Anthony Westerling, of the University of California-San Diego's Scripps Institution of Oceanography, scientists concluded that the changing climate was a greater influence on wildfire activity and intensity than forest management.