Jack Klein takes heat readings, gives fans to overheated passengers and lugs big jugs of water into the stations

On a recent August day in the subterranean furnace of New York City’s subway, one bearded, curly haired man was studying his phone for different reasons than the other wilting passengers – to track the soaring temperatures and ponder how underground train stations can cool down in an era of climate crisis.

Jack Klein, a 31-year-old construction site manager, has in the past two years taken it upon himself to become a sort of guerrilla subway heat operative, sticking teardrop-shaped thermometers to steel beams in seven of the hottest Manhattan stations and posting social media videos of the hades-like summer temperatures that commuters have to endure.

Man, 68, was left searching for help in 116F weather after his car became stuck in mud along remote park road

A French tourist recently died in Death Valley national park after a car mishap left him stranded in 116F (47C) weather.

The visitor, identified as 68-year-old Pierre Michel Formosa, was traveling with another French man along the park’s remote West Side Road when their vehicle became stuck in mud near Queen of Sheba Mine Road.

A fast-moving Nevada wildfire exploded to more than 15,000 acres (6,000 hectares) on Sunday, pushing from the Sierra foothills toward the centre of Reno and forced nearly 90,000 residents to evacuate as flames threatened neighbourhoods and reached the edge of the University of Nevada campus