Temperature in the Venusian troposphere increases linearly with altitude. At an altitude of 50km in the Venusian atmosphere, the temperature is about the same as at Earth’s surface.

At an altitude of 50km in the Venusian atmosphere, the pressure is also about the same as the earth’s surface.

http://www.datasync.com/~rsf1/vel/1918vpt.htm

What this demonstrates is that planetary temperature correlates with atmospheric pressure, not atmospheric composition. Venus’ atmosphere has 95% CO2, Earth’s atmosphere has 0.04% CO2.  Incredible that an entire field of (junk) science could be based on such a fundamental misunderstanding of basic physics.