Physical inactivity rises alongside temperature. A study in Lancet projected up to 700,000 additional deaths by 2050 and $3.68 billion in annual productivity losses.
Scientists disagree whether human-made climate change or natural fluctuations are mostly to blame for worse-than-expected heat in recent years ...
A study says warming has accelerated in the last decade, with temperatures rising nearly twice as fast as they did between 1970 and 2015.