美國最大的仙人掌——巨人柱，因亞利桑那州的極端高溫和乾旱而倒塌及死亡。仙人掌本來應該在極端天氣下生存，但43℃的高溫及缺乏雨水的情況下，這些仙人掌無法於夜間或下雨時降溫。巨人柱一般可生長到 60 英尺高，並存活約150-200 年。
Saguaro cactus, the largest cactuses in the US are collapsing and dying because of the extreme heat and drought in Arizona. Cacti are supposed to survive under extreme weather, but the high temperature of 43 degree and lack of rain, these cacti cannot cool down at night or with rain. Saguaro cactus normally can grow up to 60 feet tall and live 150-200 years.
