Still shooting from the lip, I see. Obviously you don't recall that you've been proven wrong. That's what happens when you don't know what you don't know.

Several studies have looked at UHIE as a possible biasing factor for temperature records. They all show that the effect has not influenced those records. Keep in mind that each surface set provider has corrected for any such potential contamination. Additionally, the MSU and sonde records show warming similar to the surface records, and there are no urban heat islands in space or in the sky.

So, what has caused modern warming?