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Light pollution takes another hit



 
 
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  #21  
Old August 9th 17, 05:51 PM posted to sci.astro.amateur
Chris L Peterson
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Posts: 10,007
Default Light pollution takes another hit

On Wed, 09 Aug 2017 11:37:47 -0500, Mark Storkamp
wrote:

In article ,
Razzmatazz wrote:

Back when it was much hotter and there was more CO2 in the atmosphere, there
were no people on earth. Humans are a recent phenomenon as far as geologic
time.

Razzy


Wait a minute. Are you saying there was once a higher concentration of
CO2? I thought we were on a tipping point where even a miniscule
increase would cause a runaway greenhouse effect that would make us as
hot as Venus.


There's nothing to suggest we're anywhere near such a tipping point.
There are various tipping points that apply to climate, which lead to
new metastable zones, and we may well be approaching several of those.
But nothing that would make us a new Venus.

Certainly the Earth has been much hotter in the past and has had much
higher CO2 concentrations in the past. We're currently in an ice age
(but an interglacial)- the average only gets a little lower than the
current average, but a lot higher.
  #22  
Old August 9th 17, 09:02 PM posted to sci.astro.amateur
Razzmatazz
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Posts: 265
Default Light pollution takes another hit

On Wednesday, August 9, 2017 at 11:37:48 AM UTC-5, Mark Storkamp wrote:
In article ,
Razzmatazz wrote:

Back when it was much hotter and there was more CO2 in the atmosphere, there
were no people on earth. Humans are a recent phenomenon as far as geologic
time.

Razzy


Wait a minute. Are you saying there was once a higher concentration of
CO2? I thought we were on a tipping point where even a miniscule
increase would cause a runaway greenhouse effect that would make us as
hot as Venus.


What do you mean "wait a minute"? can't you do your own research on this subject, or are you just interested in sitting on a bench and yelling at the umpires?

It is well known that in a past geologic epoch there was a lot of carbon in the atmosphere, the climate was very much hotter than today, there were no mammals, and the earth was covered by huge forests. When they died they did not decompose because there was nothing to decompose them. They fell where they died and piled up to form what we now dig up as coal deposits.

Razzy
 




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