Why global warming could be ‘rewriting race history’ at major marathon events

Runners already face a daunting challenge when they line up at the start of a marathon, but increasingly they might find themselves with another obstacle to reckon with: global warming.

​ Runners already face a daunting challenge when they line up at the start of a marathon, but increasingly they might find themselves with another obstacle to reckon with: global warming. Read More Breaking News, Latest News and Videos | CNN