JF Mezei wrote on Sat, 18 Aug 2018
12:48:30 -0400:

On 2018-08-18 10:04, Alain Fournier wrote:

CO2 is quite transparent to visible light. Sun light will go right
through and hit the ground where it will be transformed into heat. CO2
is much less transparent to infra-red radiation. So heat at ground level
will have a somewhat hard time escaping to space. It will do so by
heating the atmosphere a little higher which will then heat the
atmosphere again a little higher etc.


When you have a thick , compressed and compact atmosphere, when the
ground emits infrared, the CO2 captures it at an altitude that is part
of the weather and thus warms the atmopsphere people on the ground feel

But if most of the heat is captured by CO2 that is very very very high
up and far away from "weather" atmosphere, then the heat at that
altitude may not benefit the atmpsphere on the ground.


So Venus obviously isn't hot because most of the CO2 is 'up high' due
to lower gravity? Mayfly, meet reality.


You may get better efficiency placing black panels at ground level to
heat the low altitude atmosphere instead of moving celestial bodies to
impact Mars to add CO2 to it.

Or heck, a nuclear power plant does put out large quantities of heat day
and night.


Again you've forgotten that the point is increased atmospheric
pressure and radiation shielding, not just to make it a little warmer.


--
"Some people get lost in thought because it's such unfamiliar
territory."
--G. Behn