Click the image above to order the Junkman's:
Junk Science Judo: Self-defense Against Health Scares and Scams.

Quick Links

Junk science?
Junkman?
Short Course
Store

Feedback 
E-mail List
Archives & Links
Reading List
Fifth Anniversary

Register for JunkScience.com email updates

Contact JunkScience.com:
Steve Milloy
(Publisher) or
Barry Hearn
(Editor)




CSRwatch.com / SRIwatch.com


Support JunkScience.com
Shop Amazon.com

Consumer Distorts
DDT FAQ
Malaria Clock
Dioxin in Ben & Jerry's
Capitol Radiation
Our Swollen Future
Ozone 'Depletion'

GreenSpin
NumberWatch
Living Issues
Canada Free Press

Planetary Temperature and Atmospheric Carbon Dioxide (CO2):

June 21, 2005

One point apparently causing confusion among our readers is the relative abundance of CO2 in the atmosphere today as compared with Earth's historical levels. Most people seem surprised when we say current levels are relatively low, at least from a long-term perspective - understandable considering the constant media/activist bleat about current levels being allegedly "catastrophically high." Even more express surprise that Earth is currently suffering one of its chilliest episodes in about six hundred million (600,000,000) years.

paleocarbon.gif (17906 bytes) Given that the late Ordovician suffered an ice age (with associated mass extinction) while atmospheric CO2 levels were more than 4,000ppm higher than those of today (yes, that's a full order of magnitude higher), levels at which current 'guesstimations' of climate sensitivity to atmospheric CO2 suggest every last skerrick of ice should have been melted off the planet, we admit significant scepticism over simplistic claims of small increment in atmospheric CO2 equating to toasted planet. Granted, continental configuration now is nothing like it was then, Sol's irradiance differs, as do orbits, obliquity, etc., etc. but there is no obvious correlation between atmospheric CO2 and planetary temperature over the last 600 million years, so why would such relatively tiny amounts suddenly become a critical factor now?

Adjacent graphic 'Global Temperature and Atmospheric CO2 over Geologic Time' from Climate and the Carboniferous Period (Monte Hieb, with paleomaps by Christopher R. Scotese). Why not drop by and have a look around?

 

Home



JunkScience.com is updated almost everyday. Items from the main page are moved to the archives. Links should be good for at least the date posted. After the posting date, link reliability depends on the policy of the linked sites. Some sites require visitors to register before allowing access to articles. Material presented on this page represents the opinion of JunkScience.com. Copyright 1996-2005 JunkScience.com. All rights reserved on original works. Material copyrighted by others is used either with permission or under a claim of "fair use"



Anti-Quackery Ring
Join Now    Ring Hub    Random    << Prev      Next >>