So-called cool roofs and pavements are seen as solutions to the city's urban heat island effect.

These roofs and pavements reflect more sunlight. That transmits less heat to the surrounding air, which in turn keeps local temperatures lower.

That could be a good thing, both locally, and for the warming planet as a whole.

BUT some new reports show...both cool pavements and roofs may have some unexpected consequences. 

KPCC's Emily Guerin, who looked into cool roofs,  joined A Martinez to break it down.

To listen to the full segment, click the blue play button above.