"Dave Plowman (News)" wrote in message
...
In article ,
The Natural Philosopher wrote:
On 12/12/15 12:45, NY wrote:
"Dave Plowman (News)" wrote in message
...
In article ,
DJC wrote:
On 11/12/15 11:42, NY wrote:
Climate change happens: it is incontrovertibly warmer now than it
was in the 1800s, given that the Thames doesn't freeze over.


The Thames was a lot wider and slower flowing before embankment, it
was also a lot cleaner. So not necessarily evidence of warming.

Cleaner? Thought it was once just an open sewer. ;-)

The building of the embankment and the building of Bazalgette's sewer
to clean the Thames happened at the same time (the embankment was
built to take the sewer).

It is not established that sewage freezes above freezing point any more
than ordinary river water does.

Not just sewage in the Thames. All sorts of chemicals from the industries
of the day. Not saying that influenced the freezing point though.

But a slower flowing shallower river will freeze more easily. And I think
most would agree that the ambient temperature in large cities is
influenced by man's behaviour.

Yes.

And that difference is going to be much greater now than then.

That is arguable with much better insulated houses and buildings
rather than the flagrant use of very cheap sources of heat that is
just allowed to escape very easily due to the much worse insulation.

AS we see a complete straw man raised to obfuscate and divert attention
away from the salient fact. It was a lot colder 300 years ago than it is
now, or was 600 years ago.

You've got accurate figures world wide from 600 years ago?

Don’t need accurate figures when the difference is large
enough to produce stuff like the freezing of the thames etc.