Sport kann bei der Hitze schnell gefährlich werden.
REUTERS
A McClintock High School Chargers football player cools down during a practice session in Tempe, Arizona August 4, 2011. In a summer that has seen record heat, severe droughts and four football-practice deaths, scientists and climatologists say the risks for players are higher than ever. REUTERS/Joshua Lott (UNITED STATES - Tags: ENVIRONMENT SPORT EDUCATION)
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