Climate Science Glossary

Term Lookup

Enter a term in the search box to find its definition.

Settings

Use the controls in the far right panel to increase or decrease the number of terms automatically displayed (or to completely turn that feature off).

Term Lookup

Settings


All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.

Home Arguments Software Resources Comments The Consensus Project Translations About Donate

Twitter Facebook YouTube Pinterest

RSS Posts RSS Comments Email Subscribe


Climate's changed before
It's the sun
It's not bad
There is no consensus
It's cooling
Models are unreliable
Temp record is unreliable
Animals and plants can adapt
It hasn't warmed since 1998
Antarctica is gaining ice
View All Arguments...



Username
Password
Keep me logged in
New? Register here
Forgot your password?

Latest Posts

Archives

Human fingerprint on atmospheric CO2

Posted on 23 August 2007 by John Cook

George Morrison points out the argument Human CO2 is a tiny % of CO2 emissions says nothing about carbon isotopes and how we know rising CO2 levels are due to human activity. The carbon atom has several different isotopes (eg - different number of neutrons). Carbon 12 has 6 neutrons, carbon 13 has 7 neutrons. Plants have a lower C13/C12 ratio than in the atmosphere. If rising atmospheric CO2 comes fossil fuels, the C13/C12 should be falling. Indeed this is what is occuring (Ghosh 2003) and the trend correlates with the trend in global emissions.

Many thanks to George for pointing out the oversight - I've updated the Human CO2 page.

0 0

Bookmark and Share Printable Version  |  Link to this page | Repost this Article Repost This

Comments

Comments 1 to 4:

  1. The contrarians' dismissal of the tiny percentage of anthropogenic CO2 as therefore automatically insignificant is shown to be completely fallacious by an interesting analogy drawn by Professor Andrew Pitman, Climatologist at UNSW.

    Professor Pitman reminds us that the Ebola virus, whilst undeniably microscopic is hardly insignificant to human health.

    This link is to an interview with Martin Durkin about his mockumentary The Great Global Warming Swindle.

    See the upper video at 06.18
    0 0
  2. What, then, is the total weight of Carbon dixide in the atmosphere and what weight is calculated to have been produced by burning fossil fuels?

    Does this method of analysis distinguish between CO2 released from burning fossil fuels and "old" CO2 produced from the decay of corals? In what proportion?
    0 0
  3. CO2 = 379 ppm or 0.000380, or 0.038% currently.
    0 0
  4. A chart here shows the percentages
    0 0

You need to be logged in to post a comment. Login via the left margin or if you're new, register here.



The Consensus Project Website

TEXTBOOK

THE ESCALATOR

(free to republish)

THE DEBUNKING HANDBOOK

BOOK NOW AVAILABLE

The Scientific Guide to
Global Warming Skepticism

Smartphone Apps

iPhone
Android
Nokia

© Copyright 2014 John Cook
Home | Links | Translations | About Us | Contact Us