Thermal images of the US heatwave in Phoenix, Arizona

As the world registered the hottest month of all time in July, the south-western US city of Phoenix shattered its own 1974 heatwave record, with temperatures above 110F (43C) for 31 straight days

Carlos Barria's heat-sensitive photographs from late July reveal a Phoenix where concrete on the street registers 150F (66C), outdoor workers' bodies reach 105F (41C) and homeless people swelter, surrounded by surfaces as hot as 143F (62C).

Ulises, a landscape worker from Mexico, carries bags full of leaves