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Not just dangerous, but sometimes fatal. in death valley, a 71-year-old died from heat exposure near a trailhead after hiking amid 121 degree temps, while in houston my heart hurts. my chest hurts. reporter: jonathan longoria recently suffered a heart attack after mowing his lawn, and his doctor says the heat likely played a role. because he then was having an extra load of stress on his body from the heat in addition to the manual stress. that s what finally tipped him over the edge. reporter: in an exclusive interview, the cdc director highlighting the emergence of heat officers. we re see for the first time where folks are designating someone in charge of responding to the heat. reporter: europe also struggling with the heatwave, with summer travelers packing hot spots. our josh lederman is on the ground in greece. reporter: workers here at the acropolis are walking off the job, refusing to work in 103 degree heat, while west of athens a massive fire is still that ha ....