On 1 Sep, 08:55, "nightjar" .me.uk>
wrote:
> "Doug"
riseup.net> wrote in message
>
> news:4976a2f8-02e5-4796-a142-3a802cdc90bb@c65g2000hsa.googlegroups.com...
> On 31 Aug, 16:24, "nightjar" .me.uk>
> wrote:
>
>
>>> "Doug"
riseup.net> wrote in message>
>
>>> Satellite images reveal an opening in the famed North-west and North-
>>> east passages, with water stretching all the way round the Arctic.
>
>>> Until recently both passages had been blocked by ice since the start
>>> of the last Ice Age..."
>
>> That would come as something of surprise to Baron Nordenskjöld, who
>> navigated the North East Passage in 1878-1879 and to Roald Amundsen, who
>> navigated the North West Passage in 1903-1906.
>
>> ...
>
>>> So, warmest since the start of the last ice age about 90.000 years
>>> ago?
>
>>> Must be one of your famous 'local effects', given that the global average
>>> temperature is only just above the 30 year average at present.
>
>> What 30 year average? Source?
>
> To quote my own reply, from last time you asked for my source:
>
> 'You can choose a source from the Met Office Hadley Centre for Climate
> Change,
>
Hmm, yes, quote Hadley Centre: "...A brief look at the graph depicting
January global average temperatures reveals large variability in our
climate year-on-year, but with an underlying rise over the longer term
almost certainly caused by man-made emissions of greenhouse gases..."
"...In future, while the trend in global temperatures is predicted to
remain upwards, we will continue to see inherent variability of this
kind."
Next time it would help if you actually read your source and also gave
the relevant URL.
>
> the University of Alabama at Huntsville (UAH) or the Remote Sensing
> System (RSS), all of which agree that temperatures have been decreasing
> since 1998, with current temperatures barely above the 30 year average. Only
> NASA still shows temperatures increasing, but they are based upon surface
> temperature measurements, with some serious gaps in their geographic spread
> and the figures keep changing, due to the way they are
estimated.http://www.climateaudit.org/?p=2964explains how they have been re-writing
> history.. Both UAH and RSS, which are considered to be the most reliable
> sources, use satellite data, which cover the entire globe equally and which
> have been consistent in their application since records began. the main
> limitation of the data is that they began in 1978.'
>
>
>> I see the usual motorists suspects, who
>> dominate this transport newsgroup, are still in denial of
>> anthropogenic global warming. I wonder how much longer they will be
>> able to cling to their fond imaginings as an excuse for their
>> pollution?
>
> I wonder how long you are going to keep ignoring the growing evidence that
> climate change - there has been no warming since 1998, sources as above - is
> driven by nature and that, if man has had any effect, it is trival by
> comparison. As I have mentioned before, sun spot cycle 24 is running very
> late, a phenomenon that has previously preceeded periods of global cooling
> that lasted decades.
>
See above, GW denier.
>
>
>> The Mail has updated its version:
> ....
>> "..The pictures, produced by Nasa, mark the first time in at least
>> 125,000 years that the two shortcuts linking the Atlantic and Pacific
>> oceans have been ice-free at the same time...
>
> That is impossible to know. We can only know for certain what has happened
> since we started taking satellite images. Nobody was even looking for the
> passages until the late 15th century, so we have no written records from
> before that. However, like you, the Mail has never been one to allow the
> facts to get in the way.
>
What about ice cores?
Check this out then:
http://www.metoffice.gov.uk/corporate/pressoffice/myths/3.html
"...The bottom line is that temperature and CO2 concentrations are
linked. In recent ice ages, natural changes in the climate, such as
those due to orbit changes, led to cooling of the climate system. This
caused a fall in CO2 concentrations which weakened the greenhouse
effect and amplified the cooling. Now the link between temperature and
CO2 is working in the opposite direction. Human-induced increases in
CO2 are driving the greenhouse effect and amplifying the recent
warming."
