Football-Spieler im Tempe, Arizona beim Abkühlen in der sengenden Hitze.
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)