1 No. It would be readily apparent in barometric pressure readings, which are not any different now than they were 100+ years ago. The difference has to do with the difference in gasses of which the atmosphere is composed.

2 But Bill if planetary temperatures are rising the oceans would logically outgas as well as the amount of water vapor increase aas a result of melting and evaporation at the poles. It would probably not be much but I would think it would be measurable. After all, they tell us all the rest of this is measurable.

Unless I'm mistaken the atmospheric pressure was in fact higher during extended warm periods.

That said the whole point of this is to ask a rather rhetorical question. What, if any, influence does Global Warming have on the density of the atmosphere, not the composition. As I pointed out Mars is quite heavily influenced by planetary temperatures, and with all the water on Earth and methane frozen in permafrost here we should see a steady if almost imperceptible rise. That we don't suggests to me we are well within the bounds of any sort of natural warming.

I posted this to Facebook where I am friends with a number of climatologists/meteorologists and have yet to receive a reply. You may well be entirely correct Bill. It may have nothing to do with anything. But I can't forget Mars.

Again, as Mars warms the atmosphere thickens from 7 millibars to as much as 15 then freezes back out when the inevitable dust storms blot out the sun. It's a natural negative feedback loop, keeping Mars permanently in an almost airless ice age.

3 Well, Tim, if Global Warming was happening it might have all sorts of effects on our atmosphere which it isn’t having because Global Warming isn’t happening. You know that and don’t need me to tell you that.

The real issue is that we are not comparing apples with apples here’ We are not even comparing apples and oranges. We are comparing apples with F-16 fighter jets.

Mars has an atmosphere which has far fewer elements than ours, and it’s temperature varies through a vastly greater range than ours. Some of the gasses freeze out of the atmosphere of Mars during the cold period, so the Mars atmosphere when it is cold contains fewer gasses because some of them are no longer in the atmosphere. They are frozen out.

So of course the atmosphere becomes thinner. A significant part of it is sitting on the surface in solid form.

None of the gasses in our atmosphere freeze at naturally occurring temperature. The gasses we are adding, CO2 being one of them, are being added in quantities far too small (50 parts per million, for God’s sake) to affect barometric pressure.

Which is why Global Warming is not happening.

4 I agree Bill; that was my point about this. There is no evidence of Global Warming unless you twist and squirm to fit natural variability into the theory.

Yes, Mars is quite different than Earth. But I disagree in that we have ice at the poles which can sublimate or just plain melt and go into the atmosphere. Water vapor is THE major greenhouse gas on Earth, after all.

But you are right; Mars is so cold it's carbon dioxide atmosphere turns to dry ice and drops right out of the atmosphere.

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