Cooling goo sidewalks and other strange new weapons in the war on urban heat

Los Angeles faces a doubling of its extreme heat days but has fresh ideas to keep residents cool - and tackle the inequality of who suffers

• How US cities are scrambling to protect people from extreme heat

Los Angeles can sometimes feel like a sprawling hellscape of heat: in the northern valleys and the southern city, metal playground equipment, car steering wheels, even the ground itself effectively become weaponized.

The more than 300 days of sunshine a year that for generations have made LA such an attractive place to live and visit are becoming a grave liability due to the climate crisis.