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Believe it or not, extreme weather such as flash floods and lightning, which can only be blamed on Mother Nature, caused the least number of deaths between 2007 and 2013 — only eight. Other environment-related incidents, such as heat illness, cold exposure, and avalanche, killed the most — 26, 19, and 33, respectively. This suggests that people are not well-prepared when going into the wilderness, even in the event of an avalanche. Shouting and loud noises don’t cause them; they are usually triggered by weight — a person walking in the wrong spot or a strong wind is enough to do the trick.