Re: OT: interesting global warming quote found elsewhwere

On Aug 7, 8:08 pm, krw <k...@xxxxxxxxxxxxxxxx> wrote:
In article <489AB243.C850...@xxxxxxxxxxx>,
rabbitsfriendsandrelati...@xxxxxxxxxxx says...



bill.slo...@xxxxxxxx wrote:

Eeyore wrote:
Kris Krieger wrote:
JosephKK  wrote
Kris Krieger wrote:

[snipped]
AGW theory,

AND it is is purely THEORY !

But it is *not* a theory, in the scientific sense.  It is a
hypothesis.

So is the theory of gravity.

Hiding behing hollow phrases again I see.

Does anyone actually doubt gravity ?

You fell into the semantic trap, calling AGW a "theory".  It is in
the religious/lay sense, but certainly not in the scientific sense.

Anthropogenic global warming is certainly a hypothesis - as is every
other scientific theory. It is supported by enough scientific evidence
- which Eeyore lacks the background knowledge to understand - to be
referred to as a theory.

The evidence for recent global warming is the temperature measurments
- the earth as a whole has heated up by 0.74 +/-0.2 degrees Celcius
in the last hundred years

http://en.wikipedia.org/wiki/Global_warming

This is just enough to qualify as statistically significant against
the weather noise on the temperature measurements.

The claim that it is anthropogenic associates this warming with the
increase in atmospheric cabon dioxide levels over the same period.
We've got precise measurements from 1960 - when the CO2 level was 315
ppm - until now, where it is about 385ppm. This pretty much ties up
with the amount of fossil fuel known to have been burnt over this
period - some 30% of the carbon dioxide emitted has dissolvedin the
oceans which makes the mass balance a bit rough. There are
measurements and estaimates that give rougher figures for the first
half of the century.

Carbon dioxide is a green-house gas; the added carbon dioxide on its
own won't explain that much warming, but a warmer atmosphere holds
more water vapour and that, plus other greenhouse gases (like methane,
which has also gone up) and a bit more pressure broadening, do provide
a tolerably good fit.

There's no alternative explanation that has withstood careful
scrunity, so anthropogenic global warming is the theory that best
explains the warming we have seen.

The deniers - many of them funded by Exxon-Mobil and groups with
similar motivations - do pay a lot of attention to the more uncertain
areas of evidence, but they haven't found a viable alternative
explanation to champion, and do tend to cite exploded hyoptheses as if
they hadn't been demolished.

--
Bill Sloman, Nijmegen

.

Relevant Pages

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