Nearly 80 million people in the United States remained under a heat advisory or warning Tuesday, with scorching temperatures and humidity expected through the Fourth of July.

As many as 29 people have died due to heatstroke in South Korea, according to the South Korean Ministry of Health, Welfare and Disease Control.

An intense heat dome has swelled over Scandinavia, spurring some of the region's hottest weather ever recorded.

Coroner warning after heat-related death.

From the normally mild summer climes of Ireland, Scotland and Canada to the scorching Middle East to Southern California, numerous locations in the Northern Hemisphere have witnessed their hottest weather ever recorded over the past week.

Searing temperatures, which have been as high as 113 degrees, were below 100 on Thursday, but a sense of panic and crisis persisted in the city.

More than a billion people are at risk from a lack of air conditioning and refrigeration to keep them cool and to preserve food and medicines as global warming brings more high temperatures, a study showed on Monday.