[NittanyLion]

RE: urban warming. Based on what I've read, upper atmospheric satellite measurements don't reflect an increase in temperature. If greenhouse gases were on the rise, this increase should be present. The fact that only ground-based and lower atmospheric temps have increased is likely evidence of warming caused by man-made heat sinks, rather than greenhouse gases.

[Amelia]

The fact that only ground-based and lower atmospheric temps have increased is likely evidence of warming caused by man-made heat sinks, rather than greenhouse gases.

That's my opinion as well.