As Europe endures a record-breaking heat wave this week, heat-related deaths have risen to nearly 80 with new data from Portugal. Previously, 10 deaths had been reported across Europe — including four in Spain, two in France, and four in Italy.

Power plant operators in Switzerland and France idled reactors so that discharged cooling water would not harm wildlife in already-hot rivers.

Italy limited work outdoors, France shut schools and Turkey battled wildfires on Tuesday in a European heatwave that meteorologists said was "exceptional" for striking so early this year.