>> we are essentially looking at how different parts osan francisco are going to experience differentemperatures even when the ambient atur overall isthe same. what we are looking at really i, which refers to how hot it gets in a specific neighborhood when the temperature is a specific -- reaches a specific height. heat island effects are the result of th like asphalt infrastructure, concrete, how much tree canopy or lack of shade there is in aneighborhood. none of s by accident. we are talking about urban areas havbeen dd ntionally and structured with factorsike structural racism, redlining, historical and ongoing this thistment in certain neighborhoods have resulted in a specific parts of a city are going to be much more vulnerable to high temperatures than in others. tree canopy for example is much more prevalent in wealthier and generally wider parts of the city -- whiter parts of the city than other parts of the city that are less wealthy. kristen: it can result in a 20° temperature difference even though the ambient air is the same, just by what's around you, whether you have tr