<
erschro...@gmail.com> wrote in message
news:33fa6cf8-0af9-4e24...@g27g2000yqa.googlegroups.com...
On Feb 9, 12:06 pm, "Peter Webb" <
r.peter.webb...@gmail.com> wrote:
> <
erschroedin...@gmail.com> wrote in message
>
> > > Tell us something else that could have caused this increase
> > > ______________________________________
> > > Whatever caused the temperature increase from (say) 1850 to 1900, when
> > > anthropogenic CO2 levels were negligible.
>
> > 1. They weren't negligible.
>
> > ___________________________________
> > OK, how about from AD 0 to AD 1200?
>
> The earth wasn't warming then like it is now.
>
> ______________________________
> How, specifically?
Not as much, not as fast.
________________________________
*Specifically.* You have to make this at least look like a scientific
statement which can in principle be shown to be true or false. Is your claim
(for example) that there was no 10 year period during AD 0 to AD 1200 in
which the temperatures rose as fast as they have in the last 10 years? If
that is not your claim, what is?
>
>
>
> > 2. The sun's output was changing then; it's not changing now.
>
> > _____________________________________
> > So, climate change for the last 100 million years was driven by changes
> > by
> > the sun's output, with no anthropological component, but for the last
> > 100
> > years the mechnanism which drove climate change for 100 million years
> > stopped entirely and by an amazing co-incidence was entirely replaced by
> > anthropogenic causes?
>
> Actually, yes. But for 100 million years, there was NO source of CO2
> besides the oceans warming and releasing CO2, or volcanoes. Now there
> is.
> ______________________________________
> And the temperature has gone up and down.
Actually up since 1860 or so, except for a brief pause in the 1970s
caused by aerosols.
______________________________________
Well no, 2011 was cooler than 2010, so it has in fact gone up and down.
>
> So why should anyone be surprised that now there's a new cause
> for warming, since we know CO2 can cause warming?
> __________________________________
> Why should anyone be surprised if the earth's temperature goes up and
> down,
> when it has for 100 million years or more?
Because it's not going up and down now, just up.
______________________________
Except for the years it went down.
And the change is
much more rapid than it ever has been except when something drastic
happened, like a meteor impact.
_______________________________
Interesting claim. How do you calculate how rapid the change is at any time
(ie what is the exact claim that you are making), and where's your evidence
your statement is true?
>
>
>
> > >Or indeed any of the previous
> > > warmings or coolings.
>
> > Because a change in the earth's orbit, or massive volcanic action, or
> > a big increase in the sun's output, or a giant meteor hitting the
> > earth, might have happened in the last 50 years and we just didn't
> > notice?
> > ______________________________________________
> > No, I doubt it. Do you have evidence that every previous warming and
> > cooling
> > was caused by one of these? What about the temperature chnages from AD
> > 1000
> > to AD 1200 - what caused them?
>
> They were negligible compared to today's changes, but I'd guess solar
> output.
> ________________________________
> *What* was neglibible compared to todays changes? What chnage in
> temperature
> over what period? What is your claim, exactly?
The changes in earth's temp has been much slower than it is today.
_________________________________________
You mean today Feb 10th? Or do you mean the change over the last year? or
decade? What is your claim, exactly? Or are you intentionally trying to
leave it so vague that it is not testable, so you can't be proved wrong?
>
> But since you brought it up, you tell me.
> ________________________________
> I think that whatever drove climate chnage in the past is what is driving
> it
> today.
And you base this on what scientific evidence?
_______________________________________________
Not evidence; Occam's Razer.
>I don't know what that is, but nor am I required to present an
> alternative theory (or have one).
Aha, I see. NO scientific evidence.
__________________________________
No, plenty of evidence, no *theory*. You seem unaware of the difference.
______________________________________________
My assumption is confirmed. You don't understand the concept.
>
> But more generally, you have to establish that additional CO2 on net warms
> the atmosphere.
Been done.
_____________________________________
Great. This is what I have been asking for. What is it?
>Your argument looks only at the greenhouse gas effect.
Yeah, I guess when we're talking about atoms, we just look at matter
too.
_______________________________________
You might. Physicists probably look at electromagnetic fields and other
things as well.
>There
> are obviously many other ways in which CO2 can affect climate, most
> notably
> through vegetation growth rates.
Yes, that's why only half the CO2 we put into the atmosphere stays
there. The other goes to sinks -- oceans, plants, soil.
_______________________________________
Indeed.
>You lot need to show experimentally that
> the warming effects dominate the cooling effect, and there is *no*
> experimental evidence this is true.
Yes there is.
____________________________________
So you keep saying.
Tell you what, you tell me what scientific journals
you'd searched.
__________________________________
But again you don't tell us what it is! You must have avoided this question
10 times in this post alone; why do you keep refusing to tell us what that
evidence is?
>
> > > scientific method), you should post them. Posting "unscientific"
> > > arguments
> > > just shows how "unscientific" AGW theory is.
>
> > So why do almost all the world's scientists say otherwise? Are you
> > claiming you know more science than they do?
> > ______________________________________________
> > Why are scientists ever wrong? That's a complicated question, but the
> > fact
> > is that they often are.
>
> So almost all the world's scientists are wrong and you're right? Do
> you know what "chutzpah" means?
> ______________________________________
> This the best you can do?
When you've presented no evidence?
__________________________________
I'm not proposing an alternate theory. I'm asking for evidence of yours.
Which you can't or won't supply.
You should be glad anyone deigns
to debate with you at all.
Come back with some scientific evidence, or don't come back.
_________________________________________
Evidence for what, exactly?
*You claim* that there is experimental evidence which shows that additional
CO2 on balance warms the planet. This is the central tenet of AGW. What is
that evidence? Why won't you tell us? Is it a secret that only Believers are
supposed to know or something?