In Saudi Arabia, the number of Muslim pilgrims who’ve died amid a searing heat wave in the holy city of Mecca has topped 900, after temperatures this week soared above 125 degrees Fahrenheit. Thousands have been treated for heat exhaustion. Climate scientists warn the risk of heatstroke will continue to rise for the millions of Muslims who make the annual Hajj pilgrimage. This is Fahad Saeed, a scientist at Climate Analytics.