Tourists swelter in the US capital amid excessive heat warning

Tourists and residents swelter in Washington D.C. as temperatures go up to 36°C and 41°C heat index.

The National Weather Service has issued an excessive heat warning for the US capital. July is on track to be the hottest month in recorded history, scientists confirmed Thursday, as UN chief Antonio Guterres warned Earth has moved into an "era of global boiling" .

Searing heat intensified by global warming has affected tens of millions of people in parts of Europe, Asia and North America this month, combining with fierce wildfires that have scorched across Canada and parts of southern Europe.