[ExI] Phil Jones acknowledging that climate science isn'tsettled

[Dan]

While true on the _known_ rise in CO2 levels, it's not true in terms of climate change in historical times, no?

Regards,

Dan

From: Alfio Puglisi <alfio.puglisi at gmail.com>
To: ExI chat list <extropy-chat at lists.extropy.org>
Sent: Wed, March 3, 2010 11:56:20 AM
Subject: Re: [ExI] Phil Jones acknowledging that climate science isn'tsettled


On Wed, Mar 3, 2010 at 5:24 PM, Stefano Vaj <stefano.vaj at gmail.com> wrote:

2010/3/2 Christopher Luebcke <cluebcke at yahoo.com>:
>
>> But significant disruptions to ecosystems tend to cause a lot of suffering.
>> That's where my concern lies.
>
>Disruption as in...? Reduction in the aggregate mass of living
>organisms? Reduction of complexity? Rapid change? Mass extinction of
>some species?
>
>Any "historical" global warming-related examples of such disruptions?
>

In human history, no, because the current CO2 levels are unprecedented in the last dozen million years or so.

In more ancient times, the PETM event ( http://en.wikipedia.org/wiki/Paleocene%E2%80%93Eocene_Thermal_Maximum ) might be a good example. It was a period of "sudden" global warming (6 °C over 20,000 years) associated with major changes in marine and terrestrial life.

Alfio


      
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