What is in-flight turbulence, and when does it become dangerous for passengers and crew?

A British man's death and numerous injuries on a Singapore Airlines flight due to severe turbulence highlight the dangers of unstable air. While turbulence-related fatalities are rare, injuries are more common, especially among flight attendants. Clear-air turbulence, often near jet streams, is particularly dangerous as it occurs with no visible warning. Climate change may increase turbulence, but airlines have safety measures in place. Experts advise passengers to wear seat belts, the best defense against turbulence-related injuries.
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