Daring to turn heat up on the limits of human endurance

Explorer braves extreme terrains to study impact of rising temperatures

LONDON - What Christian Clot remembers most vividly from his days in Iran's boiling Dasht-e Lut Desert was having to stay completely still for 12 hours a day - or die.

"It was so hot I had to lie down behind some rocks between 8 am and 8 pm. Staying in a tent was too dangerous as it would have instantly overheated," he said.