Hansen still can’t find the UHI, 25 years later.
U.S. Data Since 1895 Fail To Show Warming Trend
Published: January 26, 1989
What About Urbanization? One aspect of the study that Dr. Hanson said was interesting was the finding that the urbanization of the United States has apparently not had a statistically significant effect on average temperature readings. A number of scientists have theorized that the replacement of forests and pastures by asphalt streets and concrete buildings, which retain heat, is an important cause of rising temperatures.
This would be same UHI effect which scientists measured in 1907.